bhyvectl: Prepare to add arm64 support

Move MD code into a separate directory and add a simple interface which
lets the MD bits register options and handle them.

No functional change intended.

Rev

bhyvectl: Prepare to add arm64 support

Move MD code into a separate directory and add a simple interface which
lets the MD bits register options and handle them.

No functional change intended.

Reviewed by: jhb
Sponsored by: Innovate UK
Differential Revision: https://reviews.freebsd.org/D44932

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