Telephony: SMS over IMS

Add RIL_REQUEST_IMS_REGISTRATION_STATE, RIL_REQUEST_IMS_SEND_SMS, and
RIL_UNSOL_RESPONSE_IMS_NETWORK_STATE_CHANGED.  Add FORMAT_UNKNOWN to
SmsConstants

Change-Id: Iabaf4cce9f1da94f3f263d09cdd0bc29fbea741d

Conflicts:
	telephony/java/com/android/internal/telephony/RILConstants.java