[Android][Driver] Enable PAC/BTI for Android by Default (#218066)
We enabled PAC and BTI by default in the Android Ecosystem so it makes
sense to set it as the default for Android in the Clang driver. This
change will make sure anyone compiling for Android (like through NDK)
automatically gets PAC/BTI. It should not cause issues with older
Android devices since they become nops.
Fixes: https://github.com/android/ndk/issues/1914