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vp9: Choose the scheme for modeling rd for 32x32 based on skin color.

For real time CBR mode, use model_rd_for_sb_y for 32x32 if the sb is
a skin sb to avoid visual regression on the slowly moving face.

Refer to the cl: https://chromium-review.googlesource.com/#/c/356020/

Change-Id: I42c36666b2b474ce5ee274239d52ae8ab400fd46

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -1744,8 +1744,8 @@

 #if CONFIG_VP9_HIGHBITDEPTH

       const int large_block = bsize > BLOCK_32X32;

 #else

-      const int large_block = (this_mode == NEWMV && ref_frame == LAST_FRAME) ?

-          bsize > BLOCK_32X32 : bsize >= BLOCK_32X32;

+      const int large_block =

+          x->sb_is_skin ? bsize > BLOCK_32X32 : bsize >= BLOCK_32X32;

 #endif

       mi->interp_filter = (filter_ref == SWITCHABLE) ? EIGHTTAP : filter_ref;

       vp9_build_inter_predictors_sby(xd, mi_row, mi_col, bsize);