Merge "Always use Neon." am: 8604f4b3a6 am: aa858a9636 am: cc6610ad28 am: c158b3dd0a

Original change: https://android-review.googlesource.com/c/platform/external/libyuv/+/1723955

Change-Id: I4e295a159bd707f996312c3e31335fec8ed2676c