hal: enable sidetone for VoIP calls on voice path

Add support for sidetone for VoIP calls on voice path.
Enable/disbale sidetone during VoIP call set up/tear down
and also during device switch.

CRs-fixed: 890371
Change-Id: Ib79eed79ddcd2bfed1d9bc322195036736a67cb2
3 files changed