bhyvectl: Add arm64 bits and hook it up to the build

For now this implementation doesn't provide any machine dependent
functionality on arm64, but it's enough to be able to reset and destroy
VMs.

R

bhyvectl: Add arm64 bits and hook it up to the build

For now this implementation doesn't provide any machine dependent
functionality on arm64, but it's enough to be able to reset and destroy
VMs.

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

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