[non-normative] Fix warnings with !CONFIG_LOWPRECISION_BLEND
[non-normative] Fix warnings with !CONFIG_LOWPRECISION_BLEND

The compiler was complaining about the 'bd' parameter being
unused in two functions.

Change-Id: Iac2aa86234bb9554bb2dfa6ee6628bd1d09bfb1e

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