Added the roaming flag for data call APIs

Added the roaming flag for supporting the old vendor
RIL. This parameter is just for backward compatibility
reason. The radio modem should not use it.

Test: Telephony sanity tests
bug: 32224135

Merged-In: Ibd3ba5b4c829c90bb6f65562c6c024c237a2c642
Change-Id: Ibd3ba5b4c829c90bb6f65562c6c024c237a2c642