Opus codec (sw) XML descriptor updates

add missing supported sample rates to match CDD and CTS tests.

Bug: 150356520
Test: cts -m CtsMediaTestCases -t android.media.cts.DecoderTest#testDecodeOpusChannelsAndRates

media/libstagefright/data/media_codecs_sw.xml

@@ -67,7 +67,7 @@
         <MediaCodec name="c2.android.opus.decoder" type="audio/opus">
             <Alias name="OMX.google.opus.decoder" />
             <Limit name="channel-count" max="8" />
-            <Limit name="sample-rate" ranges="48000" />
+            <Limit name="sample-rate" ranges="8000,12000,16000,24000,48000" />
             <Limit name="bitrate" range="6000-510000" />
         </MediaCodec>
         <MediaCodec name="c2.android.raw.decoder" type="audio/raw">