HFP: Update wifi network type to SOC for SCO connections.

The change checks if the VOIP/VoLTE call is over Wifi, it updates
the SOC for CxM optimisations. It avoids checking the active
connectivity network when there is an active CS call.

CRs-Fixed: 977028
Change-Id: I63783dd214375408110e6f55d44170a14d87b932