msm: cpp: Support separate input stream identity.

When the input buffer is not native, its identity can be
different from the current stream. This change adds
support to hold identity of input stream.

Change-Id: I95563337482826b9f67b6ffbfd758766f5fb4290
Signed-off-by: Iliya Varadzhakov <ivarad@codeaurora.org>
diff --git a/include/media/msmb_pproc.h b/include/media/msmb_pproc.h
index de42c38..ed4ffa2 100644
--- a/include/media/msmb_pproc.h
+++ b/include/media/msmb_pproc.h
@@ -90,6 +90,7 @@
 	uint32_t offset;
 	uint8_t native_buff;
 	uint8_t processed_divert;
+	uint32_t identity;
 };
 
 struct msm_cpp_stream_buff_info_t {