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
diff --git a/services/Android.bp b/services/Android.bp
index 971f4dd..25a0d7e 100644
--- a/services/Android.bp
+++ b/services/Android.bp
@@ -6,6 +6,7 @@
     errorprone: {
         javacflags: [
             "-Xep:AndroidFrameworkCompatChange:ERROR",
+            "-Xep:AndroidFrameworkUid:ERROR",
         ],
     },
 }