Update git submodules

* Update prebuilts/clang/host/linux-x86 from branch 'master'
  to 6fff153b540df0d83bc7a92ee8fa78bc7e378b02
  - Merge "Fix up README.md version info."
  - Fix up README.md version info.
    
    Test: N/A
    Change-Id: I9e44e7b754648bd0c9f429a6ab05f8e8c0217a87
    
1 file changed