Add CONFIG_INTERINTRA flags and reduce # of interintra modes to 4

Use CONFIG_INTERINTRA to properly separate interintra from the basic
ext_inter experiment.
When macro REDUCE_INTERINTRA_MODES is 1, only 4 ii modes are enabled
so as to reduce the complexity overhead.
(Right now the flag is off)

Change-Id: Iec6f36a1000f181adbb822ad66c7d5b2625e9cc7
diff --git a/av1/common/blockd.h b/av1/common/blockd.h
index f5fa542..e70b06c 100644
--- a/av1/common/blockd.h
+++ b/av1/common/blockd.h
@@ -383,8 +383,10 @@
 #endif  // CONFIG_EXT_INTRA
 
 #if CONFIG_EXT_INTER
+#if CONFIG_INTERINTRA
   // interintra members
   INTERINTRA_MODE interintra_mode;
+#endif
   // TODO(debargha): Consolidate these flags
   int use_wedge_interintra;
   int interintra_wedge_index;