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vp9: Speed >8: Set subpel_search_method for low motion.

Speed >=8: for resolutions above CIF, and for low motion content,
set subpel_search_method to SUBPEL_TREE_PRUNED_EVENMORE.

Small speed gain (~2%) on vga clips,
RTC metrics up by ~2-3% on average.

Change-Id: Ie26ba0264589652f92dfe74308740debf94cf0cc

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

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

@@ -585,8 +585,11 @@

     if (content == VP9E_CONTENT_SCREEN)

       sf->mv.subpel_force_stop = 3;

-    else if (cm->width * cm->height > 352 * 288)

+    else if (cm->width * cm->height > 352 * 288) {

       sf->mv.subpel_force_stop = 2;

+      if (cpi->rc.avg_frame_low_motion > 87 && cm->current_video_frame > 30)

+        sf->mv.subpel_search_method = SUBPEL_TREE_PRUNED_EVENMORE;

+    }

     if (content == VP9E_CONTENT_SCREEN) sf->lpf_pick = LPF_PICK_MINIMAL_LPF;

     // Only keep INTRA_DC mode for speed 8.