layers: GH1244, Fix Compressed BufferImageCopy errs
layers: GH1244, Fix Compressed BufferImageCopy errs

CmdCopyBufferToImage and CmdCopyImageToBuffer were validating
compressed image attributes against the valid usage conditions
for uncompressed images. Added check for compressed images and
skipped this validation, and TODO for future compressed VU addition.

Change-Id: I09a7dc98cb0f925c7486ef9f2d6de31411c7ea1c

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers