Back out pruning for horz_4 and vert_4 partitions

This change seems to drop efficiency more than expected. So backing
that out for now until a better rd based decision is found.

Change-Id: I3791a13ba76cfa38dd0df2f1fd4119b42b12291d

av1/encoder/encodeframe.c

@@ -3077,6 +3077,7 @@ static void rd_pick_partition(const AV1_COMP *const cpi, ThreadData *td,
     horz4_partition_allowed &= (pc_tree->partitioning == PARTITION_HORZ ||
                                 pc_tree->partitioning == PARTITION_HORZ_A ||
                                 pc_tree->partitioning == PARTITION_HORZ_B ||
+                                pc_tree->partitioning == PARTITION_SPLIT ||
                                 pc_tree->partitioning == PARTITION_NONE);
   }
   if (horz4_partition_allowed && !force_horz_split &&
@@ -3116,6 +3117,7 @@ static void rd_pick_partition(const AV1_COMP *const cpi, ThreadData *td,
     vert4_partition_allowed &= (pc_tree->partitioning == PARTITION_VERT ||
                                 pc_tree->partitioning == PARTITION_VERT_A ||
                                 pc_tree->partitioning == PARTITION_VERT_B ||
+                                pc_tree->partitioning == PARTITION_SPLIT ||
                                 pc_tree->partitioning == PARTITION_NONE);
   }
   if (vert4_partition_allowed && !force_vert_split &&