Assert enable_order_hint in av1_set_frame_refs.
Assert enable_order_hint in av1_set_frame_refs.

Change-Id: If50e89e47e792cf55fe76059ccad27ff5f3ae086

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