staging: kpc2000: remove SetBackEndControl() function

As this is only called twice, just call writel() like a normal driver
should :)

At the same time, clean up the formatting for the irq handler, as there
is no need to have that be incorrect, it just hurts the eyes...

Cc: Matt Sickler <Matt.Sickler@daktronics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>