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:a49d3c13aac1aa7d258665e14d8e5cc2ff7638df)
Merged-In: I843fbead461062ae3369cc0f21d606fa1cf02ceb
Change-Id: I843fbead461062ae3369cc0f21d606fa1cf02ceb