RELAND CCodec: don't drop metadata for output with flag FLAG_DROP_FRAME.

Limit scope to tunneled playback to minimize risk

Bug: 199668436
Test: TBD
Change-Id: I15e6df7b33cad605c9ace6bc25a6ae324d843e9f
diff --git a/media/codec2/sfplugin/CCodecBufferChannel.h b/media/codec2/sfplugin/CCodecBufferChannel.h
index 5a2aca2..d2862bd 100644
--- a/media/codec2/sfplugin/CCodecBufferChannel.h
+++ b/media/codec2/sfplugin/CCodecBufferChannel.h
@@ -323,6 +323,8 @@
         return mCrypto != nullptr || mDescrambler != nullptr;
     }
     std::atomic_bool mSendEncryptedInfoBuffer;
+
+    std::atomic_bool mTunneled;
 };
 
 // Conversion of a c2_status_t value to a status_t value may depend on the