Remove unused variables in blockd.h

Change-Id: I687453ab28d72412e49b4cc2676b70425b80848b

av1/common/blockd.h

@@ -502,10 +502,6 @@ typedef struct macroblockd_plane {
 #endif
   uint8_t *color_index_map;
 
-  // number of 4x4s in current block
-  uint16_t n4_w, n4_h;
-  // log2 of n4_w, n4_h
-  uint8_t n4_wl, n4_hl;
   // block size in pixels
   uint8_t width, height;
 

av1/common/onyxc_int.h

@@ -795,9 +795,6 @@ static INLINE int calc_mi_size(int len) {
 static INLINE void set_plane_n4(MACROBLOCKD *const xd, int bw, int bh) {
   int i;
   for (i = 0; i < MAX_MB_PLANE; i++) {
-    xd->plane[i].n4_w = (bw << 1) >> xd->plane[i].subsampling_x;
-    xd->plane[i].n4_h = (bh << 1) >> xd->plane[i].subsampling_y;
-
     xd->plane[i].width = (bw * MI_SIZE) >> xd->plane[i].subsampling_x;
     xd->plane[i].height = (bh * MI_SIZE) >> xd->plane[i].subsampling_y;