[Feature][T106][VOICE] add  get current call state api

Only Configure: Yes
Affected branch: master
Affected module: voice
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: Yes
Doc Update: No

Change-Id: I962b84c718031abe491c088bd6a266e20a13a1a1
(cherry picked from commit a55b20ff5313c3c6b1f33a19955c2d7f099bab93)
3 files changed