hal: Add support for VoWLAN feature

Add VoWLAN pcm id, usecase to enable voice
over WLAN feature.

Change-Id: I2d10ff06342bfcbef15a4769ba90deaeb4218107
hal: Add support for VoWLAN on MSM8974

Update the VoWLAN pcm id for MSM8974

CRs-fixed: 662362
Change-Id: Ia0894fa1347f05e55993af91da91272af3161f83