Define new permission to perform IMS RCS Reg actions and integrate...

Define new permission to perform IMS RCS Reg actions and integrate ACCESS_IMS_SINGLE_REGISTRATION into APIS

Move from MODIFY_PHONE_STATE to ACCESS_IMS_SINGLE_REGISTRATION
as per design doc.

Bug: 149426399
Bug: 173652571
Bug: 168923956
Test: atest CtsTelephonyTestCases
Merged-In: I6d4ae879d9d2b347f6576ea20f9e42454b39936b
Merged-In: Idabfda6853ec2a24544da5253ad0e43c47a6cc69
Change-Id: Ie0e1198c8b9cfa0bab90407c8d35273159f63302