add registrant for PhysicalChannelConfig change

1. remove onPhysicalChannelConfig from PhoneStateLisgtener as
only debug settings use this API today
2. instead create register/notify API in phone object to notify
physicalChannelConfig change

Bug: 140908357
Test: Manual test
Change-Id: Id1d9a03d48239b9c8493dd389013f2c5edec8436
(cherry picked from commit efb18f2b)
Merged-in: Id1d9a03d48239b9c8493dd389013f2c5edec8436