Extend light-greylist of some TelephonyManager APIs until Q.

The reasonable replacement for these APIs is
ImsMmtelManager#isAvailable(int, int); however that class is a system
API.  Given how late we are in the release cycle,  can make
ImsMmtelManager public R and leave these greylisted for now.

Test: Manual
Bug: 128696104
Change-Id: I64fa9e079e26ba16ff9ace098091c4094e9a7b33