Renamed DataSpecificRegistrationState

Renamed DataSpecificRegistrationState to
DataSpecificRegistrationInfo. And added some
APIs to test API so they can be accessed by
CTS.

Test: Manual
Bug: 127657991

Merged-In: I1a623c18f02cfd19ca1af9df912d859b363f42d1
Change-Id: I1a623c18f02cfd19ca1af9df912d859b363f42d1
(cherry picked from commit dba10320)