hal: re-enable voice call if disable during device switch

Voice call was getting de-activated if force routing is enabled
due to change in backend configuration or if there is device
switch during in-call record usecase on devices sharing same
backend.
Voice call was not restoring back upon de-activation due to the
changes added through CR 694397 to support DSDA feature.
Since DSDA feature is no longer supported, removed the changes
added to it.

Change-Id: Ic67a6ffa7a82103daaa76ebf03181956fcb61f19