Remove unused arrays in entropymode.h
Remove unused arrays in entropymode.h

Change-Id: I7f2c0bfc12451710622161bd52ff689e642d1e52

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