One more patch for the atkbd driver. It will make sure that the

One more patch for the atkbd driver.  It will make sure that the
keyboard port and interrupt is enabled and the driver is attached even
when the keyboard itself is not present when the system is booting.
(This has been the behavior through out 2.X and 3.X, but is somehow
broken in 4.0.)

# I certainly don't recommend people to `hot-plug' the AT keyboard,
# because the interface isn't designed for hot-plugging and such act
# will often break the keyboard controller.  But, so many people want to
# do that anyway...

Approved by: jkh