BT:[3/3] Send VSC to SOC for VOIP connectivity network type.

- Get Connectivity Manager instance to find current active network
when VOIP requests BT app to create SCO.
- If active connectivity network is WIFI, update same to SOC
via vendor specific command before sending SCO request for VOIP

CRs-Fixed: 821566
Change-Id: I5835e71b533e00a6e4b82607b10657ef311877ae