vts: add VtsKernelToolchain tests

Starting with API level 29, arm64 kernels will be required
to be compiled with Clang.  Add a simple test that checks /proc/version.

This test we be expanded for future architectures in future versions of
Android.

https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86/+/master/GCC_4_9_DEPRECATION.md

Bug: 111130832
Bug: 116511915
Test: mm && adb sync data && \
  adb shell /data/nativetest64/vts_kernel_toolchain/vts_kernel_toolchain
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Change-Id: Ib9de1d57256402c75f94e30a508734ea23bf1c1d
4 files changed