staging: unisys: remove BOOL,TRUE,FALSE definitions

These shouldn't be defined in the code and can be replaced with the
standard bool, true, and false usage that the kernel uses.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>