audio: fix remote submix sampling rates

Only list 48000 Hz in supported sampling rates for remote submix
output and input stream profiles to avoid mismatch betwen playback
and capture.
Bug: 10900252.

Change-Id: I165b867ce01ad6bda40747f8adf98a4c47dd5314
diff --git a/audio_policy.conf b/audio_policy.conf
index aac5c66..3cc637d 100644
--- a/audio_policy.conf
+++ b/audio_policy.conf
@@ -68,7 +68,7 @@
   r_submix {
     outputs {
       submix {
-        sampling_rates 44100|48000
+        sampling_rates 48000
         channel_masks AUDIO_CHANNEL_OUT_STEREO
         formats AUDIO_FORMAT_PCM_16_BIT
         devices AUDIO_DEVICE_OUT_REMOTE_SUBMIX
@@ -76,7 +76,7 @@
     }
     inputs {
       submix {
-        sampling_rates 44100|48000
+        sampling_rates 48000
         channel_masks AUDIO_CHANNEL_IN_STEREO
         formats AUDIO_FORMAT_PCM_16_BIT
         devices AUDIO_DEVICE_IN_REMOTE_SUBMIX