Deprecate the use of bmi structure from av1 codec

Change-Id: I7f5010ae3b9a014b3dca0425c9eada3b9e2c0ab3
diff --git a/av1/common/blockd.h b/av1/common/blockd.h
index 50281d3..606a1de 100644
--- a/av1/common/blockd.h
+++ b/av1/common/blockd.h
@@ -359,10 +359,7 @@
 #endif
 } MB_MODE_INFO;
 
-typedef struct MODE_INFO {
-  MB_MODE_INFO mbmi;
-  b_mode_info bmi[4];
-} MODE_INFO;
+typedef struct MODE_INFO { MB_MODE_INFO mbmi; } MODE_INFO;
 
 #if CONFIG_INTRABC
 #define NO_FILTER_FOR_IBC 1  // Disable in-loop filters for frame with intrabc