sm6250-common: audio: Remove 2 instance support for "primary input"

As FM app no longer uses app loopback,
2 instances of "primary input" is not needed

Change-Id: I7d5e941e916bdf221798ca89360e4751d4af322b

audio/audio_policy_configuration.xml

@@ -168,7 +168,7 @@
                              channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
                 </mixPort>
 
-                <mixPort name="primary input" role="sink" maxOpenCount="2" maxActiveCount="2">
+                <mixPort name="primary input" role="sink">
                     <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
                              samplingRates="8000,11025,12000,16000,22050,24000,32000,44100,48000"
                              channelMasks="AUDIO_CHANNEL_IN_MONO,AUDIO_CHANNEL_IN_STEREO,AUDIO_CHANNEL_IN_FRONT_BACK"/>