Harmonize and fix coeff context computation
Harmonize and fix coeff context computation

Change-Id: I75740e221deb3872647bd480ae506ba68800e8c7

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