AV1 RT: Reduce TX size search for intra frames in speed 7

This will improve key frame encoding on speed 7 in 1.7 times with
neglidgible effect on overall video quality.

Change-Id: Iee9321f1ed787ace01dfc7de66a4111058ea8cb4

av1/encoder/speed_features.c

diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index e6199fa..e096377 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -1446,6 +1446,7 @@
   }
 
   if (speed >= 7) {
+    sf->tx_sf.intra_tx_size_search_init_depth_sqr = 2;
     sf->part_sf.partition_search_type = VAR_BASED_PARTITION;
 
     sf->gm_sf.gm_search_type = GM_DISABLE_SEARCH;
@@ -1511,7 +1512,6 @@
   }
 
   if (speed >= 8) {
-    sf->tx_sf.intra_tx_size_search_init_depth_sqr = 2;
     sf->intra_sf.intra_pruning_with_hog = 1;
     sf->rt_sf.estimate_motion_for_var_based_partition = 1;
     sf->rt_sf.short_circuit_low_temp_var = 1;