Enable 32-bit armv8 NEON for libavc

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: 65568114
Test: lunch aosp_arm64; emulator # on oc-mr1-dev; boot to home screen
Change-Id: I7d0c75045fc69523861ed5a00f6033ac327f4031
diff --git a/Android.bp b/Android.bp
index ac7d304..35e8fc0 100644
--- a/Android.bp
+++ b/Android.bp
@@ -77,7 +77,7 @@
                 "-DDEFAULT_ARCH=D_ARCH_ARM_NONEON",
             ],
 
-            armv7_a_neon: {
+            neon: {
                 srcs: [
                     "decoder/arm/ih264d_function_selector_a9q.c",
                     "common/arm/ih264_intra_pred_chroma_a9q.s",
@@ -322,7 +322,7 @@
                 "-DDISABLE_NEON",
             ],
 
-            armv7_a_neon: {
+            neon: {
                 srcs: [
                     "encoder/arm/ih264e_function_selector_a9q.c",
                     "common/arm/ih264_resi_trans_quant_a9.s",