ASoC: msm8960: Add LPA volume control

LPA volume is controlled via dsp stream volume support
available. Add TLV mixer control to set LPA stream volume

Signed-off-by: Asish Bhattacharya <asishb@codeaurora.org>
diff --git a/sound/soc/msm/msm-pcm-routing.h b/sound/soc/msm/msm-pcm-routing.h
index c45f95b..7dacebc 100644
--- a/sound/soc/msm/msm-pcm-routing.h
+++ b/sound/soc/msm/msm-pcm-routing.h
@@ -78,4 +78,5 @@
 	int stream_type);
 void msm_pcm_routing_dereg_phy_stream(int fedai_id, int stream_type);
 
+int lpa_set_volume(unsigned volume);
 #endif /*_MSM_PCM_H*/