new system API getRadioAccessFamily

1. new API in telephonyManager to getRadioAccessFamily
2. define bitmask for radioAccessFamily based on NetworkType because
we don't want to expose two sets of definition RIL_RADIO and Network
type together in public API surface
3. convert definition to NetworkType

Bug: 118351153
Test: telehony unit test
Change-Id: I4a71c61929d9df8ec13c157e0452c6f30d8e4b9c