Add a CTS test for ServiceStateTable

Add a simple CTS test for ServiceStateTable to verify
access to the VOICE_REG_STATE.

Bug: 179730843
Test: atest ServiceStateTest
Merged-In: Id8a618aae150e73b17c84c84bf6091042e32ccb8
Change-Id: Id8a618aae150e73b17c84c84bf6091042e32ccb8
2 files changed