Remove an obsolete TODO about II_SMOOTH_PRED.

This has been taken care of already.

Change-Id: I0198fdbcd48fc355013de79644513279c8acb0de

av1/common/enums.h

diff --git a/av1/common/enums.h b/av1/common/enums.h
index 6285c5f..d6237a6 100644
--- a/av1/common/enums.h
+++ b/av1/common/enums.h
@@ -367,8 +367,6 @@
   MOTION_MODES
 } MOTION_MODE;
 
-// TODO(urvang): Consider adding II_SMOOTH_PRED if it's helpful.
-
 #if CONFIG_EXT_INTER
 typedef enum {
   II_DC_PRED = 0,