configs: msm8937: Add support for hfp pcm loopback id.

Added support for hfp pcd device id for loopback support

Change-Id: I205d229aa3b2ebdbeff5502d1d655e1c1e6ac4bf
diff --git a/configs/msm8937/audio_platform_info_sdm429w_dvt2.xml b/configs/msm8937/audio_platform_info_sdm429w_dvt2.xml
index f179369..f757d23 100644
--- a/configs/msm8937/audio_platform_info_sdm429w_dvt2.xml
+++ b/configs/msm8937/audio_platform_info_sdm429w_dvt2.xml
@@ -56,6 +56,7 @@
         <param key="spkr_1_tz_name" value="wsa881x.0f"/>
         <param key="spkr_2_tz_name" value=""/>
         <param key="hfp_vol_mixer_ctl" value="SLIMBUS_7 LOOPBACK Volume"/>
+        <param key="hfp_pcm_dev_id" value="18"/>
     </config_params>
     <acdb_ids>
         <device name="SND_DEVICE_OUT_SPEAKER_PROTECTED" acdb_id="136"/>