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vp9: Partition logic adjustment for speed 6 feature.

When adapt_partition_source_sad is enabled (currently only at
speed 6 for resoln <= 360p): use lower subsize (8x8 instead of 16x16)
for nonrd_select_partition on 32X32 blocks.

And force avoiding rectangular partition checks in
nonrd_pick_partition for speed >= 6.

Small increase ~0.5 in metrics for speed 6 on rtc_derf,
no change in speed.

Change-Id: Id751bc8f7573634571b2d6f5e29627cd5cebccae

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -3650,6 +3650,9 @@

       !force_horz_split && xss <= yss && bsize >= BLOCK_8X8;

   (void)*tp_orig;

+  // Avoid checking for rectangular partitions for speed >= 6.

+  if (cpi->oxcf.speed >= 6) do_rect = 0;

+

   assert(num_8x8_blocks_wide_lookup[bsize] ==

          num_8x8_blocks_high_lookup[bsize]);

@@ -3877,6 +3880,8 @@

   PARTITION_TYPE partition;

   BLOCK_SIZE subsize;

   RD_COST this_rdc;

+  BLOCK_SIZE subsize_ref =

+      (cpi->sf.adapt_partition_source_sad) ? BLOCK_8X8 : BLOCK_16X16;

   vp9_rd_cost_reset(&this_rdc);

   if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols) return;

@@ -3890,7 +3895,7 @@

     nonrd_pick_partition(cpi, td, tile_data, tp, mi_row, mi_col, bsize, rd_cost,

                          0, INT64_MAX, pc_tree);

   } else if (bsize == BLOCK_32X32 && partition != PARTITION_NONE &&

-             subsize >= BLOCK_16X16) {

+             subsize >= subsize_ref) {

     x->max_partition_size = BLOCK_32X32;

     x->min_partition_size = BLOCK_8X8;

     nonrd_pick_partition(cpi, td, tile_data, tp, mi_row, mi_col, bsize, rd_cost,