hal: Add support for VoWLAN feature

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

Change-Id: I2d10ff06342bfcbef15a4769ba90deaeb4218107
diff --git a/hal/msm8974/platform.h b/hal/msm8974/platform.h
index e80d3f1..d9b4302 100644
--- a/hal/msm8974/platform.h
+++ b/hal/msm8974/platform.h
@@ -194,21 +194,25 @@
 #define VOICE2_CALL_PCM_DEVICE 14
 #define VOLTE_CALL_PCM_DEVICE 17
 #define QCHAT_CALL_PCM_DEVICE 18
+#define VOWLAN_CALL_PCM_DEVICE 30
 #elif PLATFORM_APQ8084
 #define VOICE_CALL_PCM_DEVICE 20
 #define VOICE2_CALL_PCM_DEVICE 13
 #define VOLTE_CALL_PCM_DEVICE 21
 #define QCHAT_CALL_PCM_DEVICE 06
+#define VOWLAN_CALL_PCM_DEVICE -1
 #elif PLATFORM_MSM8610
 #define VOICE_CALL_PCM_DEVICE 2
 #define VOICE2_CALL_PCM_DEVICE 13
 #define VOLTE_CALL_PCM_DEVICE 15
 #define QCHAT_CALL_PCM_DEVICE 14
+#define VOWLAN_CALL_PCM_DEVICE -1
 #else
 #define VOICE_CALL_PCM_DEVICE 2
 #define VOICE2_CALL_PCM_DEVICE 22
 #define VOLTE_CALL_PCM_DEVICE 14
 #define QCHAT_CALL_PCM_DEVICE 20
+#define VOWLAN_CALL_PCM_DEVICE -1
 #endif
 
 #ifdef PLATFORM_MSM8x26