Build support for 32-bit armv8-a

Since both armv7-a-neon and 32-bit armv8-a have NEON, we can treat them
the same in Android.bp.

Bug: 62895439
Test: Built modified aosp_arm64 with armv8-a as its TARGET_2ND_CPU_ARCH
      successfully.

Change-Id: Ib6db0c1515b0b59d76b2a3a2798cc12a7eea5914
1 file changed