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vp9-rtc: Avoid TM intra on big blocks for screen

For screen content real-time mode: don't check TM
intra for bsize >= BLOCK_32X32.

Small speedup and avoid some artifacts seen
in scrolling screen content.

Change-Id: I72d7731eeb6ac9ee96e65af522c1a9aabb6dc4ef

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -588,7 +588,10 @@

       int i;

       if (content == VP9E_CONTENT_SCREEN) {

         for (i = 0; i < BLOCK_SIZES; ++i)

-          sf->intra_y_mode_bsize_mask[i] = INTRA_DC_TM_H_V;

+          if (i >= BLOCK_32X32)

+            sf->intra_y_mode_bsize_mask[i] = INTRA_DC_H_V;

+          else

+            sf->intra_y_mode_bsize_mask[i] = INTRA_DC_TM_H_V;

       } else {

         for (i = 0; i < BLOCK_SIZES; ++i)

           if (i > BLOCK_16X16)