Offset probabilities of compound types for cb4x4
Offset probabilities of compound types for cb4x4

BUG=aomedia:313

Change-Id: Ic1a9e20e5fd3f645d3be851d7be759cf4caf7c02

luctrudeau/aom,GrokImageCompression/aom,smarter/aom,luctrudeau/aom,smarter/aom,GrokImageCompression/aom,smarter/aom,luctrudeau/aom,smarter/aom,GrokImageCompression/aom,smarter/aom,GrokImageCompression/aom,luctrudeau/aom,GrokImageCompression/aom,luctrudeau/aom,GrokImageCompression/aom,luctrudeau/aom,smarter/aom