marlin: Add paths for bt-sco echo reference

Add paths for bt-sco echo reference

Bug: 29581152
Change-Id: I8eba22ebd9ef1d48392e82f8c503240dc11dd776
diff --git a/mixer_paths.xml b/mixer_paths.xml
index 9eebe21..e849770 100644
--- a/mixer_paths.xml
+++ b/mixer_paths.xml
@@ -467,6 +467,18 @@
         <ctl name="AUDIO_REF_EC_UL1 MUX" value="QUAT_MI2S_TX" />
     </path>
 
+    <path name="bt-sco-echo-reference">
+        <ctl name="AUDIO_REF_EC_UL1 MUX" value="AUX_PCM_RX" />
+    </path>
+
+    <path name="echo-reference bt-sco">
+       <path name="bt-sco-echo-reference" />
+    </path>
+
+    <path name="echo-reference bt-sco-wb">
+       <path name="bt-sco-echo-reference" />
+    </path>
+
     <path name="deep-buffer-playback">
         <ctl name="SLIMBUS_0_RX Audio Mixer MultiMedia1" value="1" />
     </path>
diff --git a/mixer_paths_tasha_t50.xml b/mixer_paths_tasha_t50.xml
index c43acae..48496ae 100755
--- a/mixer_paths_tasha_t50.xml
+++ b/mixer_paths_tasha_t50.xml
@@ -452,6 +452,18 @@
         <ctl name="AUDIO_REF_EC_UL1 MUX" value="SLIM_RX" />
     </path>
 
+    <path name="bt-sco-echo-reference">
+        <ctl name="AUDIO_REF_EC_UL1 MUX" value="AUX_PCM_RX" />
+    </path>
+
+    <path name="echo-reference bt-sco">
+       <path name="bt-sco-echo-reference" />
+    </path>
+
+    <path name="echo-reference bt-sco-wb">
+       <path name="bt-sco-echo-reference" />
+    </path>
+
     <path name="deep-buffer-playback">
         <ctl name="SLIMBUS_0_RX Audio Mixer MultiMedia1" value="1" />
     </path>