t0lte: fix incall bt audio quality

The rate for both modem and bt pcm needs to match at 8000 if using bt.
This requires us to stop and start the streams when switching devices.

Change-Id: I7ddf761ff84db917121e62d66fe18479a0452827
t0lte: Fix switching incall devices

This fixes switching incall devices with the bt incall fix.

Change-Id: I72a7c6046a8ab63a6f9e31876a794abda3c3c612