Temporarily disable simple_bwd_adapt

This allows time to investiage the bug related to issue#917, adn the
experiment should be re-enabled after a proper fix is in place for
the issue.

BUG=aomedia:917

Change-Id: I12f65bbe9fa80e823d0949533c3df0c60790ffeb

build/cmake/aom_config_defaults.cmake

@@ -191,7 +191,7 @@ set(CONFIG_RECT_TX_EXT 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_REFERENCE_BUFFER 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_REF_ADAPT 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_SEGMENT_ZEROMV 0 CACHE NUMBER "AV1 experiment flag.")
-set(CONFIG_SIMPLE_BWD_ADAPT 1 CACHE NUMBER "AV1 experiment flag.")
+set(CONFIG_SIMPLE_BWD_ADAPT 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_SMOOTH_HV 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_STRIPED_LOOP_RESTORATION 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_TEMPMV_SIGNALING 1 CACHE NUMBER "AV1 experiment flag.")

configure

@@ -533,7 +533,6 @@ post_process_cmdline() {
       soft_enable ext_comp_refs
       soft_enable ext_delta_q
       soft_enable parallel_deblocking
-      soft_enable simple_bwd_adapt
       soft_enable loopfilter_level
     fi