[chroma_sub8x8] Fix to chroma boundary calc
[chroma_sub8x8] Fix to chroma boundary calc

Disable the 2 sample adjustment when chroma_sub8x8 is enabled.

Bdrate: midres: -0.02, cif: -0.0

Change-Id: If86a64b49a2f5b284bc833f36d9f8a05235741bc

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