Changes to APIs for CarrierRestrictionRules class

Add @NonNull annotation where applicable.
Rename isCarrierIdentifiersAllowed into areCarrierIdentifiersAllowed.
Make Builder class final.

Bug: 126375826
Bug: 126699079
Bug: 126700761
Test: Compilation
Change-Id: I1a02bc007f147597df97eaa55c00fd31a952870b
2 files changed