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Set min_block_size for aq_mode=3 to 8x8.

For real-time mode under cbr, this increases the gain (5-10%)
for speed 5 (none/little change for 6), on vc-clips.

Change-Id: I9b38beeb3c820de22c43a0ba53a9456168dd24ba

--- a/vp9/encoder/vp9_aq_cyclicrefresh.c

+++ b/vp9/encoder/vp9_aq_cyclicrefresh.c

@@ -204,7 +204,7 @@

     // Some of these parameters may be set via codec-control function later.

     cr->max_sbs_perframe = 10;

     cr->max_qdelta_perc = 50;

-    cr->min_block_size = BLOCK_16X16;

+    cr->min_block_size = BLOCK_8X8;

     cr->time_for_refresh = 1;

     // Set rate threshold to some fraction of target (and scaled by 256).

     cr->thresh_rate_sb = (rc->sb64_target_rate * 256) >> 2;