audio: Add audio-playback-voip bt-a2dp mixer path.

There is requirement of audio-playback-voip bt-a2dp mixer path
as , during transition phase it is possible that
APM can call a2dp routing based on setPhoneState() / setForceUse()
API.
Add audio-playback-voip bt-a2dp mixer path (to avoid out_write errors)

Change-Id: If79043b1b517948cceb9eb04b6d6f01628c315ba
diff --git a/configs/sdm670/mixer_paths_mtp.xml b/configs/sdm670/mixer_paths_mtp.xml
index c5d2cf2..82b01a7 100644
--- a/configs/sdm670/mixer_paths_mtp.xml
+++ b/configs/sdm670/mixer_paths_mtp.xml
@@ -1593,6 +1593,10 @@
         <ctl name="SLIMBUS_7_RX Audio Mixer MultiMedia10" value="1" />
     </path>
 
+    <path name="audio-playback-voip bt-a2dp">
+        <ctl name="SLIMBUS_7_RX Audio Mixer MultiMedia10" value="1" />
+    </path>
+
     <path name="audio-playback-voip bt-sco-wb">
         <ctl name="BT SampleRate" value="KHZ_16" />
         <path name="audio-playback-voip bt-sco" />
diff --git a/configs/sdm670/mixer_paths_tavil.xml b/configs/sdm670/mixer_paths_tavil.xml
index d77f623..0409cc1 100644
--- a/configs/sdm670/mixer_paths_tavil.xml
+++ b/configs/sdm670/mixer_paths_tavil.xml
@@ -1686,6 +1686,10 @@
         <ctl name="SLIMBUS_7_RX Audio Mixer MultiMedia10" value="1" />
     </path>
 
+    <path name="audio-playback-voip bt-a2dp">
+        <ctl name="SLIMBUS_7_RX Audio Mixer MultiMedia10" value="1" />
+    </path>
+
     <path name="audio-playback-voip bt-sco-wb">
         <ctl name="BT SampleRate" value="KHZ_16" />
         <path name="audio-playback-voip bt-sco" />
diff --git a/configs/sdm845/mixer_paths_tavil.xml b/configs/sdm845/mixer_paths_tavil.xml
index 4a05733..87bdae0 100644
--- a/configs/sdm845/mixer_paths_tavil.xml
+++ b/configs/sdm845/mixer_paths_tavil.xml
@@ -1697,6 +1697,10 @@
         <ctl name="SLIMBUS_7_RX Audio Mixer MultiMedia10" value="1" />
     </path>
 
+    <path name="audio-playback-voip bt-a2dp">
+        <ctl name="SLIMBUS_7_RX Audio Mixer MultiMedia10" value="1" />
+    </path>
+
     <path name="audio-playback-voip bt-sco-wb">
         <ctl name="BT SampleRate" value="KHZ_16" />
         <path name="audio-playback-voip bt-sco" />