Allow full RD TX size search for GF/ALT at speed 2

For speed 3 and above, such search is only allowed at speed 3.
The change helped cif and stdhd set by 1.2% and .7% in compression,
but increased the encoding time by around 5%.

Change-Id: Ifa4832327f1c1bef3decb032ceb769cbf50e059f

vp9/encoder/vp9_speed_features.c

diff --git a/vp9/encoder/vp9_speed_features.c b/vp9/encoder/vp9_speed_features.c
index 86ab7dc..bfde370 100644
--- a/vp9/encoder/vp9_speed_features.c
+++ b/vp9/encoder/vp9_speed_features.c
@@ -80,9 +80,6 @@
   }
 
   if (speed >= 2) {
-    sf->tx_size_search_method = frame_is_intra_only(cm) ? USE_FULL_RD
-                                                        : USE_LARGESTALL;
-
     if (MIN(cm->width, cm->height) >= 720)
       sf->disable_split_mask = cm->show_frame ? DISABLE_ALL_SPLIT
                                               : DISABLE_ALL_INTER_SPLIT;
@@ -104,6 +101,8 @@
   }
 
   if (speed >= 3) {
+    sf->tx_size_search_method = frame_is_intra_only(cm) ? USE_FULL_RD
+                                                        : USE_LARGESTALL;
     if (MIN(cm->width, cm->height) >= 720)
       sf->disable_split_mask = DISABLE_ALL_SPLIT;
     else