isRcsVolteSingleRegistrationCapable does not check provisioned config

Update the logic of isRcsVolteSingleRegistrationCapable only to check
the device and carrier capabilities no matter whether it is allowed
or not in the provisioned config.

Bug: 189494430
Test: atest TeleServiceTests:RcsProvisioningMonitorTest
Test: atest CtsTelephonyTestCases:android.telephony.ims.cts.ImsServiceTest
Change-Id: Ie61f3383eafd182da46735a86f63dc654b66c472
3 files changed