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
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:63fc17abcab6abae7411d63e15194873c6d99122)
Merged-In: I3fc4c9097602147e44ef77ad80defd33d8f5a2fc
Change-Id: I3fc4c9097602147e44ef77ad80defd33d8f5a2fc