hfp: change initial codec from MSBC_T1 to CVSD

4.11.2 Audio Connection Setup by HF For all HF initiated audio connection
establishments for which both sides support the Codec Negotiation feature,
the HF shall trigger the AG to establish a Codec Connection. This is
necessary because only the AG knows about the codec selection and settings
of the network.

In the event we do not support codec negotiation we should make our initial
codec CVSD

Bug: 66324788
Change-Id: Ib68129ea1399c54224109e3ca7ba12784973d68f