Build the optimized memset(). am: 7aea3e8806 am: b5227be158

Original change: https://android-review.googlesource.com/c/platform/external/arm-optimized-routines/+/2304572

Change-Id: Ifdb9788e5c6758265ca04f50530c9656883bc222
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>