intrabc: Fix compatibility with global motion
intrabc: Fix compatibility with global motion

Change-Id: I64ec8d3b67db10b2d2d1cc130f845baf26d122c2

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