Update git submodules

* Update frameworks/support from branch 'androidx-master-dev'
  to 2b73d3897d34138a3fe55e1f81d98bd81ede690f
  - Merge "Fixed handshake issue in `CarAppService`" into androidx-master-dev
  - Fixed handshake issue in `CarAppService`
    
    The newly-introduced `Session` caused some NPEs because the onHandshakeComplete
    callback was setting some data into a Session/CarContext instance that has yet
    to be created until onAppCreate is called.
    
    This change makes AppInfo to be lazily-initialized and also fixed a minor bug
    in the min-api retrieval logic, by default to the current API if the min-api metadata
    key is not found.
    
    Relnote: n/a
    Test: ./gradlew car:app:app:CarAppServiceTest & ./gradlew car:app:app:AppInfoTest
    Bug: 171424518
    
    Change-Id: I28db055beee93b7135439ad2888290a53ff31b7c