[NORMATIVE] Turn on FRAME_REFS_SIGNALING by default
[NORMATIVE] Turn on FRAME_REFS_SIGNALING by default

This is an adopted tool by AOM.

Change-Id: I1e8ae95b21ed865bd755d4767a03d9818f615199

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