Remove an unused mv speed feature

Change-Id: Iabef0b025304139b2894f1bf877bf49ce7c41b04

av1/encoder/speed_features.c

diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index 76ec863..f7ba40b 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -680,7 +680,6 @@
       sf->intra_uv_mode_mask[i] = UV_INTRA_DC_CFL;
     }
     sf->partition_search_breakout_rate_thr = 500;
-    sf->mv.reduce_first_step_size = 1;
     sf->simple_model_rd_from_var = 1;
     sf->lpf_pick = LPF_PICK_FROM_Q;
     sf->mv.subpel_force_stop = QUARTER_PEL;
@@ -804,7 +803,6 @@
   }
   sf->gm_erroradv_type = GM_ERRORADV_TR_0;
   sf->disable_adaptive_warp_error_thresh = 1;
-  sf->mv.reduce_first_step_size = 0;
   sf->mv.auto_mv_step_size = 0;
   sf->comp_inter_joint_search_thresh = BLOCK_4X4;
   sf->adaptive_rd_thresh = 0;

av1/encoder/speed_features.h

diff --git a/av1/encoder/speed_features.h b/av1/encoder/speed_features.h
index 636a136..8a7823f 100644
--- a/av1/encoder/speed_features.h
+++ b/av1/encoder/speed_features.h
@@ -226,10 +226,6 @@
   // Motion search method (Diamond, NSTEP, Hex, Big Diamond, Square, etc).
   SEARCH_METHODS search_method;
 
-  // This parameter controls which step in the n-step process we start at.
-  // It's changed adaptively based on circumstances.
-  int reduce_first_step_size;
-
   // If this is set to 1, we limit the motion search range to 2 times the
   // largest motion vector found in the last frame.
   int auto_mv_step_size;

av1/encoder/tpl_model.c

diff --git a/av1/encoder/tpl_model.c b/av1/encoder/tpl_model.c
index 95bd703..6728bfa 100644
--- a/av1/encoder/tpl_model.c
+++ b/av1/encoder/tpl_model.c
@@ -138,7 +138,7 @@
   xd->plane[0].pre[0].buf = ref_frame_buf;
   xd->plane[0].pre[0].stride = stride_ref;
 
-  step_param = mv_sf->reduce_first_step_size + tpl_sf->reduce_first_step_size;
+  step_param = tpl_sf->reduce_first_step_size;
   step_param = AOMMIN(step_param, MAX_MVSEARCH_STEPS - 2);
 
   av1_set_mv_search_range(&x->mv_limits, &best_ref_mv1);