Correct av1_cdef_compute_sb_list() declaration

To be consistent with definition, fixing a visual studio build
warning.

Change-Id: I6a44de7f343466e9eda7ae916e6e95d678766887
diff --git a/av1/common/cdef.h b/av1/common/cdef.h
index 5680baf..c36fd13 100644
--- a/av1/common/cdef.h
+++ b/av1/common/cdef.h
@@ -37,8 +37,9 @@
 extern "C" {
 #endif
 
-int av1_cdef_compute_sb_list(const CommonModeInfoParams *mi_params, int mi_row,
-                             int mi_col, cdef_list *dlist, BLOCK_SIZE bsize);
+int av1_cdef_compute_sb_list(const CommonModeInfoParams *const mi_params,
+                             int mi_row, int mi_col, cdef_list *dlist,
+                             BLOCK_SIZE bsize);
 void av1_cdef_frame(YV12_BUFFER_CONFIG *frame, AV1_COMMON *cm, MACROBLOCKD *xd);
 
 void av1_cdef_search(YV12_BUFFER_CONFIG *frame, const YV12_BUFFER_CONFIG *ref,