hal: Add support for VoWLAN feature

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

Change-Id: I2d10ff06342bfcbef15a4769ba90deaeb4218107
diff --git a/hal/audio_hw.c b/hal/audio_hw.c
index 7589f0e..49b209e 100644
--- a/hal/audio_hw.c
+++ b/hal/audio_hw.c
@@ -119,6 +119,7 @@
     [USECASE_VOICE2_CALL] = "voice2-call",
     [USECASE_VOLTE_CALL] = "volte-call",
     [USECASE_QCHAT_CALL] = "qchat-call",
+    [USECASE_VOWLAN_CALL] = "vowlan-call",
     [USECASE_COMPRESS_VOIP_CALL] = "compress-voip-call",
     [USECASE_INCALL_REC_UPLINK] = "incall-rec-uplink",
     [USECASE_INCALL_REC_DOWNLINK] = "incall-rec-downlink",