crc: Add a utility to compute the CRC of a frame

The discom-crc utility computes the CRC of a frame using the same
algorithm as the DISCOM hardware block. This is useful to precompute CRC
values and then compare them with the hardware-generated values.

The utility computes the CRC on data stored in a file passed as a
command line argument. It supports two optional arguments, --crop and
--size, to specify the crop rectangle and the image size. The size only
needs to be specified if a crop rectangle is set, it is deduced from the
file size otherwise.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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