Upgrade AndroidFrameworkUid to be fatal error.

We've fixed the one remaining example of code that accidentally
crosses UID with userId, so this change upgrades the check to become
a fatal build error to prevent future bugs.

Bug: 155703208
Test: atest error_prone_android_framework_test
Change-Id: I3bc46f8039a88b5f3d5f89dc9b5fda785d5c654f