Clear up permission READ_PRIVILEGED_PHONE_STATE.

- Group all events that need the permisson together
- Enforce the permission of the group mask instead of multiple individuals
- Clear up javadoc of APIs require the permission

Bug: 148021947
Test: make offline-sdk-docs
Test: atest com.android.internal.telephony.TelephonyRegistryTest
Test: atest android.telephony.cts.PhoneStateListenerTest
Test: atest com.android.internal.telephony.PhoneStateListenerTest
Change-Id: I6c801039e3eaf22bae052de6569cf1d9a5b28396