Update git submodules

* Update platform/prebuilts/clang/host/darwin-x86 from branch 'master'
  to 97d95d2f2471bf5aeaf4466f1c6e2620721b10ee
  - Merge "Remove unused clang-r475365."
  - Remove unused clang-r475365.
    
    Test: N/A
    Bug: None
    Change-Id: I535c280e83436e687601c6fb35b4072a79f4ee9b
    

* Update platform/prebuilts/clang/host/linux-x86 from branch 'master'
  to d7b7f78e6c691f907f19051f1bca99cafc454325
  - Merge "Remove unused clang-r475365."
  - Remove unused clang-r475365.
    
    Test: N/A
    Bug: None
    Change-Id: I10e3dd8a656ab60cab231a9edc05a95d29d54249
    

* Update platform/prebuilts/clang/host/windows-x86 from branch 'master'
  to 3494fdd6f80cd97c80dc3d562cbebbb425e58444
  - Merge "Remove unused clang-r475365."
  - Remove unused clang-r475365.
    
    Test: N/A
    Bug: None
    Change-Id: Ic6ed844839b12acda134742feb5077ae294a73ed
    
3 files changed