classes: provide a class for generating dm-verity meta-data images

This adds a class that allows to generate conversions of ext[234] and
btrfs partitions images with dm-verity hash data appended at the end as
well as a corresponding .env file containing the root hash and data
offset that can be stored in a secure location (e.g. signed fitImage)
or signed and verified at run-time on its own.

The class depends on two variables:
  DM_VERITY_IMAGE:      defines the name of the main image (normally the
                        one that is used with the bitbake command to
                        build the main image)
  DM_VERITY_IMAGE_TYPE: defines exactly one type for which to generate
                        the protected image.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

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