Set audio mode after accepting the call

Set the audio mode to incall immediately after accepting the call and not wait
till call is reported as ACTIVE by RIL. This is done to speed up time taken for audio
to set up the voice path

(CM change: Remove calls to Rlog, since we haven't imported that yet)

Bug: 7612431
Change-Id: I8008edc64928016ab94aa6d770de248b5d85dc93