hal: add single session VSID voice call support

With new Voice architecture, a voice session per subscription
will support different call types such as Voice/VoLTE/VoWLAN etc.
These new voice sessions will be tagged with new VSID.

CAF-commit: 0e109353

Change-Id: I7e9c90fb3935ebce5ff281f2d1c25c66aa96e55e