Add janitors to the OWNERS file am: ad2c0b21c6

Original change: https://android-review.googlesource.com/c/platform/external/cpu_features/+/3423353

Change-Id: Ia7812c0d3429f9ddfd77f16224ad32da646efec7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>