layers: Clang-format only, no code changes
layers: Clang-format only, no code changes

This is a whole-file clang format of buffer_validation.cpp, with
no code changes. Left as a separate commit to avoid confusion with
the actual code changes within this file in the other 2 commits.

Change-Id: I4e09c0a465f5187d3753a88bcbafb0e8bee9d782

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools