bhyve: Add arm64 support to the gdb stub

- Add -G to the arm64 getopt handler.
- Add static register definitions and extensible XML definitions.
- Provide definitions for MD bits such as breakpoint

bhyve: Add arm64 support to the gdb stub

- Add -G to the arm64 getopt handler.
- Add static register definitions and extensible XML definitions.
- Provide definitions for MD bits such as breakpoint encoding and
length.
- Ensure that bhyve re-injects breakpoint exceptions that it is not
responsible for.

Reviewed by: andrew
Sponsored by: Innovate UK
Differential Revision: https://reviews.freebsd.org/D44740

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