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:b1821a1d75ef8fdaafb37df12c8ea7333ece0fb9)
Merged-In: I87517e9b116e5c6ca4ba05729139455c09a31d53
Merged-In: I3e08f85d8d6c5de119f024a518d499dcd86f6006
Merged-In: I83537fde6cad2073e767d56c27cd25b82f29c235
Change-Id: I83537fde6cad2073e767d56c27cd25b82f29c235