Update git submodules

* Update platform/external/rust/crates/cfg-if from branch 'master'
  to 838aed4e32d2878d76e01d9952556b85f677c8c2
  - Update TEST_MAPPING
    
    Test: cd external/rust/crates && atest --host -c
    Change-Id: I3ad7010de6d4ac6ab11c1c71e8bfdde8c62a8f79
    
  - Adding bluetooth apex am: 3a0379aa3d am: 8f6cc8e659 am: cbc894463f
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1931447
    
    Change-Id: I3cb787e0405970b93c1f23bbd22597fd797be0b5
    
  - Adding bluetooth apex am: 3a0379aa3d am: 8f6cc8e659
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1931447
    
    Change-Id: I16d2e1f9562d253acc91a5984b9dff865e2a3e1e
    
  - Adding bluetooth apex am: 3a0379aa3d
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1931447
    
    Change-Id: Ia75f47f785a253a62344f51a9cb3fb4aa76c2123
    
  - Merge "Refresh Android.bp, cargo2android.json, TEST_MAPPING." am: ffca6617a5 am: 989fb443a2 am: fbe37b9478
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1912185
    
    Change-Id: I50198a62d8a6a1e042baac3662602734c68cf3ba
    
  - Merge "Refresh Android.bp, cargo2android.json, TEST_MAPPING." am: ffca6617a5 am: 989fb443a2
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1912185
    
    Change-Id: Ibb8dcf21274ae03903d88b565c262f71dd279763
    
  - Merge "Refresh Android.bp, cargo2android.json, TEST_MAPPING." am: ffca6617a5
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1912185
    
    Change-Id: I9c24587700c0d155cd131db19b194d478501e78c
    
  - [automerger skipped] Merge "Merge sc-qpr1-dev-plus-aosp-without-vendor@7810918" into stage-aosp-master am: 2ce5eb7157 -s ours am: f904476b90 -s ours
    
    am skip reason: Merged-In I1bd91bc5f1679dae4ff6af8377dff700b0c4a55a with SHA-1 f478b28da2 is already in history
    
    Original change: https://googleplex-android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/16278463
    
    Change-Id: Icf9af7ef93e40236b546d54940b8b76f8f8c1b4f
    
  - [automerger skipped] Merge "Merge sc-qpr1-dev-plus-aosp-without-vendor@7810918" into stage-aosp-master am: 2ce5eb7157 -s ours
    
    am skip reason: Merged-In I1bd91bc5f1679dae4ff6af8377dff700b0c4a55a with SHA-1 f478b28da2 is already in history
    
    Original change: https://googleplex-android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/16278463
    
    Change-Id: I61576fb42e9f21b770c7895805b4cd5095d42853
    
  - Make vendor available. am: 35d3f2c663 am: 70aca29264 am: 0fba8e0b7b
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1887216
    
    Change-Id: I6d803f03aa30e404de565c2b794a669be04ed67b
    
  - Make vendor available. am: 35d3f2c663 am: 70aca29264
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1887216
    
    Change-Id: Ie3d5344f0faed0354fce97ffbaddd380d45a6854
    
  - Add apex_available. am: 030e665e47 am: 76641df7be am: db1b76a7e3 am: e70f6bff08
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1874545
    
    Change-Id: I83e8a420500782cf57654b92fca7118145c26287
    
  - Add apex_available. am: 030e665e47 am: 76641df7be am: db1b76a7e3
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1874545
    
    Change-Id: Ia56d4f8afeb519b35bc0fd49ee4a8a6954690d97
    
  - Add apex_available. am: 030e665e47 am: 76641df7be
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1874545
    
    Change-Id: Ifdfb9f3c92cf587eb72eb7c27480cab01aebe507
    
  - Update TEST_MAPPING am: 68d81bfa50 am: 43c539dc08 am: 0259ce9d49 am: f478b28da2
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1842388
    
    Change-Id: Ib06869af0a1698cb66f572dbd9fdb446356775cb
    
  - Update TEST_MAPPING am: 1fd951651a am: 77bbbf4833 am: 7d2b08c97c am: 7f9c81f133
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1813816
    
    Change-Id: I8095df4c3b34b7decdaedc707f8787d0a3b253e7
    
  - Update TEST_MAPPING am: 77fd95d8bc am: bea6e06c55 am: 638091cf9c am: 77b27f8570
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1806118
    
    Change-Id: Ife483ff2b52717b5a427870eeb52fc3a93079986
    
  - Make std dependency injection conditional am: 3ab505921e am: f68b60ff73 am: f5718fa9bd
    
    Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cfg-if/+/1759001
    
    Change-Id: I89807be2b30582c9f78527b13a34050c550d6335