Add @UnsupportedAppUsage annotations to telephony-common.

See go/UnsupportedAppUsage for more details.

This is needed to not lose greylist information, by moving telephony-common from bootclasspath in ag/9025572.

Bug: 137350495
Test: m

Change-Id: I71ac29d6d7b4964a828397cb0afda82384311031