ASOC: msm8x60: support to device_mute is added.

Device mute control is added which can mute the
respective dev_id to volume zero.
msm_device_mute() in user space will use this
control.

CRs-Fixed: 295399
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>
diff --git a/include/sound/q6afe.h b/include/sound/q6afe.h
index b9436bf..133a065 100644
--- a/include/sound/q6afe.h
+++ b/include/sound/q6afe.h
@@ -64,4 +64,5 @@
 int afe_port_start_nowait(u16 port_id, union afe_port_config *afe_config,
 	u32 rate);
 int afe_port_stop_nowait(int port_id);
+int afe_apply_gain(u16 port_id, u16 gain);
 #endif /* __Q6AFE_H__ */