API: Separates getting roaming according to overridden or non-overridden

1. New API
 - TelephonyDisplayInfo#IsRoaming returns true if device is roaming
   overridden by carrier config.
 - NetworkRegistrationInfo #isNetworkRoaming, #isNetworkRegistered,
   #isNetworkSearching and #getNetworkResitrationState return
   roaming value of network without overridden by carrier config or
   overlay resource.
2. Deprecated API
 - NetworkRegistrationInfo #isRoaming, #isRegistered, #isSearching
   and #getResitrationState.

Bug: 260017781
Test: atest CtsTelephonyTestCases:NetworkRegistrationInfoTest
Change-Id: I025b64145caa772b27c410ae5836224f2e922fa1