Revert [Telephony mainline] Add SystemApi and NonNull annotation
Reason: Revisit and redesign in S Bug: 147390517 Test: make Change-Id: I0749492a5648dfa2fb83271f349a8370972f7032 Merged-In: I0749492a5648dfa2fb83271f349a8370972f7032 (cherry picked from commit 2d280f1b)
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