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
Test: builds
Flag: EXEMPT bugfix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:d1b983e1e6aa2e8952ecee073ac16eeb89c9f6bb)
Merged-In: Ied09800f02e03a52efe39f959265da7cb1e1ddc0
Change-Id: Ied09800f02e03a52efe39f959265da7cb1e1ddc0