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bitlk: Add support for dumping master key and activating using it

Vojtěch Trefný requested to merge vtrefny/cryptsetup:master_bitlk-master-key-dump-activate into master

We already had most of the code in BITLK_activate, so this is just moving some code to helper functions to make this possible.activate_by_volume_key currently accepts only the FVEK (= the "real" master key), not the VMK (key used to protect FVEK). If someone asks for VMK support in the future, we can add it, but for now this basically "what --dump-master-key dumps can be used to activate" and nothing more.

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