Update git submodules

* Update frameworks/support from branch 'androidx-main'
  to 7875334149b066fe9c1f4c4e2c651cb43d642e1c
  - Merge "Remove redundant project paths" into androidx-main
  - Remove redundant project paths
    
    Projects that match gradle's expected structure do not need
    their explicit paths specified. This patch leaves non-compliant
    projects with explicit paths.
    
    Test: ./gradlew tasks
    Change-Id: Ib2691e06152e02bd203483d6cb3473e8ec3263f0
    Merged-In: Ib2691e06152e02bd203483d6cb3473e8ec3263f0