Build the optimized memset(). am: 7aea3e88 am: b5227be1 am: b3a2c82c

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



Change-Id: I026f09de07f4abc5fb111ba3493bbee9bfc58ab7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>