[NORMATIVE] Enable NO_FRAME_CONTEXT_SIGNALING by default.
[NORMATIVE] Enable NO_FRAME_CONTEXT_SIGNALING by default.

BUG=aomedia:1437

Change-Id: Ifdb65ff3b0447c8d16103eb9a628535b37cd0e9f

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