Use resolve_device instead of poll_device in order to allow use persistent block device naming in encryptssh

[carbolymer]

Currently encryptssh hook is using poll_device function to poll device with encryption key: https://github.com/grazzolini/mkinitcpio-utils/blob/master/initcpio/hooks/encryptssh#L19
It would be better to follow persistent block device naming: https://wiki.archlinux.org/title/Persistent_block_device_naming
similarly to encrypt encrypt hook:
https://github.com/archlinux/svntogit-packages/blob/packages/cryptsetup/trunk/hooks-encrypt#L16

I believe resolve_device could be just used in place of poll_device for this purpose.

[mickybart]

I'm proposing a PR #17 to fix this issue and much more.
The code has been reworked to align with the one from cryptsetup package (encrypt). That permit to use discard and disable workqueue for SSD as documented for encrypt in https://wiki.archlinux.org/title/Dm-crypt/Specialties