Allow core uids to register receiver as "android".

System components can run in any processes belonging to
core uids. If one of such components end up registering
a receiver, it will get registered as "android".

Bug: 387930030
Bug: 310632322
Test: builds
Flag: EXEMPT bugfix
Merged-In: Ied09800f02e03a52efe39f959265da7cb1e1ddc0
Change-Id: I3fc4c9097602147e44ef77ad80defd33d8f5a2fc