Rename block_yrd_txfm to block_rd_txfm

This function is also used with the U and V planes.

Change-Id: Ib6beae0438790bfb690b3a2bda9c5c8b0e89a9b8

vp9/encoder/vp9_rdopt.c

diff --git a/vp9/encoder/vp9_rdopt.c b/vp9/encoder/vp9_rdopt.c
index fde8429..cea1f29 100644
--- a/vp9/encoder/vp9_rdopt.c
+++ b/vp9/encoder/vp9_rdopt.c
@@ -588,8 +588,8 @@
                            args->scan, args->nb);
 }
 
-static void block_yrd_txfm(int plane, int block, BLOCK_SIZE plane_bsize,
-                           TX_SIZE tx_size, void *arg) {
+static void block_rd_txfm(int plane, int block, BLOCK_SIZE plane_bsize,
+                          TX_SIZE tx_size, void *arg) {
   struct rdcost_block_args *args = arg;
   MACROBLOCK *const x = args->x;
   MACROBLOCKD *const xd = &x->e_mbd;
@@ -698,7 +698,7 @@
   rd_stack->nb = so->neighbors;
 
   foreach_transformed_block_in_plane(xd, bsize, plane,
-                                     block_yrd_txfm, rd_stack);
+                                     block_rd_txfm, rd_stack);
   if (rd_stack->skip) {
     *rate       = INT_MAX;
     *distortion = INT64_MAX;