Added AIDL for CellIdentityCdma, CellIdentityGsm, CellIdentityLte
and CellIdentityWcdma. This is the preliminary change for IWLAN
refactoring as network registration state will be moving into
system API.
Test: Build
bug: 64132030
Merged-In: I6763d4b6e51cf354b01ee5bfb5d37114394f3063
Change-Id: I6763d4b6e51cf354b01ee5bfb5d37114394f3063
(cherry picked from commit 31db18a4c0)