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vp9-rtc: Disable nonrd_keyframe for SVC, speed >=8

For speed >= 8: disable nonrd_keyframe SVC with
spatial_layers > 1. In this case having base
spatial layer key frame with higher quality
(hybrid mode search) is beneficial, without too
much cpu cost (since its on lowest spatial layer).

Change-Id: Iff7c43aed4e808603d8abdedb6eb5d2c9c8ecb8d

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

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

@@ -728,7 +728,10 @@

   if (speed >= 8) {

     sf->adaptive_rd_thresh = 4;

     sf->skip_encode_sb = 1;

-    sf->nonrd_keyframe = 1;

+    if (cpi->svc.number_spatial_layers > 1 && !cpi->svc.simulcast_mode)

+      sf->nonrd_keyframe = 0;

+    else

+      sf->nonrd_keyframe = 1;

     if (!cpi->use_svc) cpi->max_copied_frame = 4;

     if (cpi->row_mt && cpi->oxcf.max_threads > 1)

       sf->adaptive_rd_thresh_row_mt = 1;