Improve OWNERS coverage across frameworks/base/. am: fab0ab3c9c am: c7c4a74a78

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1519383

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I5120a3701af3564f363900b20bca75f3ad2a854c