bhyve/riscv: Initial import.

Add machine-dependent parts for bhyve hypervisor to support
virtualization on RISC-V ISA.

No objection: markj
Sponsored by: UK Research and Innovation
Differential Revi

bhyve/riscv: Initial import.

Add machine-dependent parts for bhyve hypervisor to support
virtualization on RISC-V ISA.

No objection: markj
Sponsored by: UK Research and Innovation
Differential Revision: https://reviews.freebsd.org/D45512

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