staging: unisys: get rid of HAVE_UNLOCKED_IOCTL code

We definitely have it, so there's no point in keeping the older stuff
around. Get rid of the #ifdefs and old code.

Signed-off-by: Ken Depro <kenneth.depro@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>