Revert "configs: Add built-in mic to primary input sources"

This reverts commit 1c57390b961d2eaee6817d91e9453832780261bf.
As per surround sound recording design reverting this
commit to remove built-in mic from primary inputs.

CRs-fixed: 2128229
Change-Id: I1ab03aa76a7d70c87d02102c273370693d807ba7
diff --git a/configs/sdm670/audio_policy_configuration.xml b/configs/sdm670/audio_policy_configuration.xml
index 8e51ba5..418cf42 100644
--- a/configs/sdm670/audio_policy_configuration.xml
+++ b/configs/sdm670/audio_policy_configuration.xml
@@ -328,7 +328,7 @@
                 <route type="mix" sink="voice_rx"
                        sources="Telephony Rx"/>
                 <route type="mix" sink="primary input"
-                       sources="Built-In Mic,Wired Headset Mic,BT SCO Headset Mic,FM Tuner,USB Device In,Telephony Rx"/>
+                       sources="Wired Headset Mic,BT SCO Headset Mic,FM Tuner,USB Device In,Telephony Rx"/>
                 <route type="mix" sink="surround_sound"
                        sources="Built-In Mic,Built-In Back Mic"/>
                 <route type="mix" sink="record_24"