Staging: xgifb: remove __KERNEL__ #ifdef in XGIfb.h

The code inside this #ifdef declared a couple extern functions that
weren't used anywhere, so remove the whole #ifdef

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Cc: Arnaud Patard <apatard@mandriva.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>