hal: Update STHAL about Voicecall usecase.

SVA detetions are happening during voice call in progress.
Because STHAL is not updated about the voice call usecase and hence SVA is
not being paused.

Fix this issue by sending callback to STHAL from AHAL.

Change-Id: I441aeec56fae5bcfbab3eed6697f08e6901024e6