bhyve: Move some more amd64-specific drivers to their own subdir

[markj]

Summary

No functional change intended.

[jhb]

usr.sbin/bhyve/snapshot.c

139

Hummm, this is fine for now. I suspect some of Gustav's other changes in flight for this stuff might remove the need for this as a hardcoded table anyway.

[markj]

usr.sbin/bhyve/snapshot.c

139

Yes, this is ugly, but so is the table. Device model drivers should contain whatever metadata is needed for snapshots to work.

[markj]

Rebase, handle review feedback.

[emaste]

Will you combine all of the move-amd64-files into one commit?

[markj]

In D40551#951026, @emaste wrote:

Will you combine all of the move-amd64-files into one commit?

I could, but I wasn't specifically planning to. Do you have a preference?

[emaste]

In D40551#951037, @markj wrote:

I could, but I wasn't specifically planning to. Do you have a preference?

At first I saw only a couple of changes moving files and it seemed a bit odd, then I realized there's a dozen or so. Given that it's already split up like this I'd leave it alone rather than spending a lot more effort for little value.