config: Add INT0_MI2S_RX as echo-reference port for SDM630 skush

- Add INT0_MI2S_RX as audio internal echo reference port for
recording in handset mode. This port is used for far end AFE
port during echo cancellation.

CRs-Fixed: 2063851
Change-Id: I0803dd4608bae2624e364f8cd6153a541f8748c9
diff --git a/configs/sdm660/mixer_paths_skush.xml b/configs/sdm660/mixer_paths_skush.xml
index 70203ce..054515d 100644
--- a/configs/sdm660/mixer_paths_skush.xml
+++ b/configs/sdm660/mixer_paths_skush.xml
@@ -403,6 +403,10 @@
         <ctl name="AUDIO_REF_EC_UL1 MUX" value="INT4_MI2S_RX" />
     </path>
 
+   <path name="echo-reference handset">
+       <ctl name="AUDIO_REF_EC_UL1 MUX" value="INT0_MI2S_RX" />
+   </path>
+
     <path name="echo-reference headphones">
         <ctl name="AUDIO_REF_EC_UL1 MUX" value="INT0_MI2S_RX" />
     </path>