Remove single_tile_decoding from aomenc

Removed single_tile_decoding from aomenc.

BUG=aomedia:1989

Change-Id: Ib99df2b89a9f72388379446467ca3255ff7b2243

apps/aomenc.c

diff --git a/apps/aomenc.c b/apps/aomenc.c
index 3e4b059..4a47418 100644
--- a/apps/aomenc.c
+++ b/apps/aomenc.c
@@ -417,9 +417,6 @@
 #if CONFIG_AV1_ENCODER
 static const arg_def_t cpu_used_av1 =
     ARG_DEF(NULL, "cpu-used", 1, "CPU Used (0..8)");
-static const arg_def_t single_tile_decoding =
-    ARG_DEF(NULL, "single-tile-decoding", 1,
-            "Single tile decoding (0: off (default), 1: on)");
 static const arg_def_t rowmtarg =
     ARG_DEF(NULL, "row-mt", 1,
             "Enable row based multi-threading (0: off (default), 1: on)");
@@ -628,7 +625,6 @@
                                        &auto_altref,
                                        &sharpness,
                                        &static_thresh,
-                                       &single_tile_decoding,
                                        &rowmtarg,
                                        &tile_cols,
                                        &tile_rows,
@@ -686,7 +682,6 @@
                                         AOME_SET_ENABLEAUTOALTREF,
                                         AOME_SET_SHARPNESS,
                                         AOME_SET_STATIC_THRESHOLD,
-                                        AV1E_SET_SINGLE_TILE_DECODING,
                                         AV1E_SET_ROW_MT,
                                         AV1E_SET_TILE_COLUMNS,
                                         AV1E_SET_TILE_ROWS,

av1/av1_cx_iface.c

diff --git a/av1/av1_cx_iface.c b/av1/av1_cx_iface.c
index 3bc7411..33560f5 100644
--- a/av1/av1_cx_iface.c
+++ b/av1/av1_cx_iface.c
@@ -154,7 +154,7 @@
   0,                            // render width
   0,                            // render height
   AOM_SUPERBLOCK_SIZE_DYNAMIC,  // superblock_size
-  0,                            // Single tile decoding is off by default.
+  1,                            // this depends on large_scale_tile.
   0,                            // error_resilient_mode off by default.
   0,                            // s_frame_mode off by default.
   0,                            // film_grain_test_vector