Add more Gatekeeper OWNERS am: b75cfb13cd

Original change: https://android-review.googlesource.com/c/platform/system/gatekeeper/+/2477516

Change-Id: I91312c0fb5e1e57a7b75d855b6750f8025125bd9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>