C2SoftAvcDec: revert flex YUV handling

Bug: 185145002
Test: atest android.media.cts.AdaptivePlaybackTest#testH264_adaptiveDrc
Change-Id: I95991b6ec9bfacaa8182c717e26df874ad531a0c
diff --git a/media/codec2/components/avc/C2SoftAvcDec.h b/media/codec2/components/avc/C2SoftAvcDec.h
index ed99ad1..5c07d29 100644
--- a/media/codec2/components/avc/C2SoftAvcDec.h
+++ b/media/codec2/components/avc/C2SoftAvcDec.h
@@ -155,6 +155,7 @@
     uint8_t *mOutBufferFlush;
 
     size_t mNumCores;
+    IV_COLOR_FORMAT_T mIvColorFormat;
     uint32_t mOutputDelay;
     uint32_t mWidth;
     uint32_t mHeight;