rtc: Change subpel motion speed feature for speed 11

Change the setting to usee reduce_mv_pel_precision_lowcomplex
to get better quality, with acceptable speed loss.

Change-Id: I525e555274987d1ad4999007d636b03d215c8124
diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index 741a66b..374ea4e 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -1464,7 +1464,7 @@
     if (is_360p_or_larger) {
       sf->part_sf.fixed_partition_size = BLOCK_32X32;
       sf->rt_sf.use_fast_fixed_part = 1;
-      sf->mv_sf.subpel_force_stop = HALF_PEL;
+      sf->rt_sf.reduce_mv_pel_precision_lowcomplex = 2;
     }
     sf->rt_sf.increase_source_sad_thresh = 1;
     sf->rt_sf.part_early_exit_zeromv = 2;