Add getters for emer-reg flag to fix build warning

Bug: 341105139
Test: atest CtsTelephonyTestCases
Flag: ImsRegistrationAttributes.ATTR_REGISTRATION_TYPE_EMERGENCY
Flag: ImsRegistrationAttributes.ATTR_VIRTUAL_FOR_ANONYMOUS_EMERGENCY_CALL
Change-Id: Id9fcdf1c4604cfb54ef1bb86d67e319985dcf782
2 files changed