Don't allow non-system uids to use "android" as calling package.

Bug: 310632322
Test: atest ./BroadcastsSecurityTest/src/android/app/cts/broadcasts/BroadcastRegistrationTest.java
Flag: EXEMPT bugfix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:0e91977c4ebfdfe4e2124373d22f99dfe211a06b)
Merged-In: I3e08f85d8d6c5de119f024a518d499dcd86f6006
Change-Id: I3e08f85d8d6c5de119f024a518d499dcd86f6006