Fix passing explicit stage files

Every platform ought to set `stages', `stage1' and optionally `stage2'
in md_init(), otherwise passing explicit files results won't work as
`stages' is zero-initialised and no default path is set:

	# installboot -nv wd0 ./ofwboot
	usage:	installboot [-nv] [-r root] disk [stage1]
		installboot [-nv] -p disk

This is correct synopsis and ought to work, but macppc_installboot.c
(others, too) has an empty md_init().  Set stage bits to fix this:

	# ./obj/installboot -nv wd0 ./ofwboot
	Using / as root
	would install bootstrap on /dev/rwd0c
	using first-stage ./ofwboot
	would copy ./ofwboot to /tmp/installboot.Ymmm6QU8OJ/ofwboot

Using `stage1' leads to a bit more cleanup since early MI installboot.c
handles `-r', i.e. write_filesystem() no longer has needs to do the
fileprefix() dance itself.

This makes regress/usr.sbin/installboot pass on macppc (while being lucky
or carrying miod's fix for the kernel disklabel race manifesting on vnd).

OK gkoehler

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