ANDROID: Remove android/OWNERs file

An OWNERS file does now exist in the root directory and the fear that it
would be excessively permissive has not become a reality.  Simplify the
situation by inheriting directly from it instead of proving an override.

Bug: 314749503
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I795eee3d7b44aa0f91a2ac4d9a27d0c7cbdc1cc6