Refactor sequence level coding tools setting
Refactor sequence level coding tools setting

All sequence level parameters should be set in init_config()
and not av1_change_config() - which should really be used for
on-the-fly changes to the configurations/options. This patch
collects the setting of various sequence level coding tools into
a common function called from init_config().

Change-Id: I1cc9aea0568878b10f1cbaf72334b635e839a71b

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom