android: Add test_APK script for layer validation
android: Add test_APK script for layer validation

This is a script we've been using internally for a while, no reason
not to make it public.  It installs our layer validation tests, runs
them, and gathers output.  Improvements are welcome!

Usage:

  ./test_APK.sh -s <serial number> -p <plaform name> -f <gtest_filter>

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers