Enable 32-bit armv8 NEON for libmopus

Since ARM neon instructions were only used on armv7-a-neon
architecture variant, the default implementation for this
library doesn't use these advanced SIMD instructions.

Bug: 65568205
Test: lunch aosp_arm64; emulator # on oc-mr1-dev; boot to home screen
      Check if NEON related source code has been built and included in
      libopus.so.
Change-Id: Ia24e60b3fabcbd4108bd336d5cbec787c98e1a2b
1 file changed