hal: Add support for VoWLAN feature

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

Change-Id: I2d10ff06342bfcbef15a4769ba90deaeb4218107
diff --git a/hal/voice.h b/hal/voice.h
index a7733b1..5e4ce7f 100644
--- a/hal/voice.h
+++ b/hal/voice.h
@@ -24,7 +24,7 @@
 #define VOICE_SESS_IDX     (BASE_SESS_IDX)
 
 #ifdef MULTI_VOICE_SESSION_ENABLED
-#define MAX_VOICE_SESSIONS 4
+#define MAX_VOICE_SESSIONS 5
 #else
 #define MAX_VOICE_SESSIONS 1
 #endif