devfs - sync devfs after cloning a device

 * Use case are devices such as tty_pty which create a ptm/foo node as
   the cloned one, but also create a slave node (in pts/foo).

 * Without this, it's possible that ptm/foo is created before pts/foo
   is, and the program may race and not see pts/foo yet.
Implemented casuword for vkernel64. Fix two typos in casuword for pc64.
Add a ufoma(4) manual page (from FreeBSD).
usb.4: Sync parts of the manual page with FreeBSD.
Some usb4bsd manpage related shuffling/additions in Makefiles.
in_pcbbind: Merge duplicated prison_replace_wildcards()
in_pcbconn_bind: Remove duplicated prison_replace_wildcards()