In the devfs case, have initproc attempt the easy cases of mounting /dev.

This works if /dev exists, or if / is read/write (nfsroot).  If it is
too hard, leave it up to init -d (which will probably fail if /dev does
not exist, but there isn't much else we can do short of making a union
mount on /).

This means we get a proper /dev if you boot a 5.x kernel on a 4.x world,
which I happen to do often (the ramdisks on our install netboot servers
have 4.x userland worlds on them).

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