[NORMATIVE] Film grain chroma_scaling_from_luma bug fix
[NORMATIVE] Film grain chroma_scaling_from_luma bug fix

BUG=aomedia:1649

Change-Id: I2638bc1d5e825fcbc8b99bfad57e66b95a3abcec

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