Fix sse and dist in predict_dc_only_block for hbd

STATS_CHANGED for hbd encoding

Change-Id: I7f6af28631d798c426c2635df31b213aa8bdc5d7
diff --git a/av1/encoder/tx_search.c b/av1/encoder/tx_search.c
index 09b4b63..92e996359 100644
--- a/av1/encoder/tx_search.c
+++ b/av1/encoder/tx_search.c
@@ -2194,6 +2194,9 @@
 
     x->plane[plane].eobs[block] = 0;
 
+    if (is_cur_buf_hbd(xd))
+      *block_sse = ROUND_POWER_OF_TWO((*block_sse), (xd->bd - 8) * 2);
+
     best_rd_stats->dist = (*block_sse) << 4;
     best_rd_stats->sse = best_rd_stats->dist;