configs: remove default sampling rate and channel entries for bt a2dp

Remove default setting of sampling rate to 48K and stereo channel
for bt a2dp as support for multiple sampling rates and channels
over a2dp is added and being set from hal.

Change-Id: I67313a1ba5f04512ca1e2e79f42d725d0ce8e1e9
diff --git a/configs/msmnile/mixer_paths_pahu.xml b/configs/msmnile/mixer_paths_pahu.xml
index 3fda33c..2a36e19 100644
--- a/configs/msmnile/mixer_paths_pahu.xml
+++ b/configs/msmnile/mixer_paths_pahu.xml
@@ -2348,8 +2348,6 @@
     </path>
 
     <path name="bt-a2dp">
-        <ctl name="BT SampleRate" value="KHZ_48" />
-        <ctl name="AFE Input Channels" value="Two" />
         <ctl name="SLIM7_RX ADM Channels" value="Two" />
     </path>