CCodec: update skip-cut-buffers for relevant setting changes only

Sample rate and channel counts should be the only settings that
triggers skip-cut-buffer update.

Bug: 150270199
Test: atest CtsMediaTestCases:DecoderTestAacDrc
Change-Id: Iecf54833d6b484374e6336fd31d8038a441e1c30
diff --git a/media/codec2/sfplugin/CCodecBuffers.h b/media/codec2/sfplugin/CCodecBuffers.h
index bae08e0..85ca5d5 100644
--- a/media/codec2/sfplugin/CCodecBuffers.h
+++ b/media/codec2/sfplugin/CCodecBuffers.h
@@ -228,8 +228,9 @@
     int32_t mDelay;
     int32_t mPadding;
     int32_t mSampleRate;
+    int32_t mChannelCount;
 
-    void setSkipCutBuffer(int32_t skip, int32_t cut, int32_t channelCount);
+    void setSkipCutBuffer(int32_t skip, int32_t cut);
 
     DISALLOW_EVIL_CONSTRUCTORS(OutputBuffers);
 };