tools: mkimage: add dm-verity Merkle-tree generation

When mkimage encounters a dm-verity subnode inside a component image
node it now automatically invokes veritysetup(8) with --no-superblock
to generate the Merkle hash tree, screen-scrapes the Root hash and Salt
from the tool output, and writes the computed properties back into the
FIT blob.

The user only needs to specify algorithm, data-block-size, and
hash-block-size in the ITS; mkimage fills in digest, salt,
num-data-blocks, and hash-start-block. Because --no-superblock is
used, hash-start-block equals num-data-blocks with no off-by-one.

The image data property is replaced with the expanded content (original
data followed directly by the hash tree) so that subsequent hash and
signature subnodes operate on the complete image.

fit_image_add_verification_data() is restructured into two passes:
dm-verity first (may grow data), then hashes and signatures.

Signed-off-by: Daniel Golle <[email protected]>
Reviewed-by: Simon Glass <[email protected]>

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