x86: clean up arch/x86/kernel/aperture_64.c

whitespace cleanup. No code changed:

   text    data     bss     dec     hex filename
   2080      76       4    2160     870 aperture_64.o.before
   2080      76       4    2160     870 aperture_64.o.after

                                       errors   lines of code   errors/KLOC
 arch/x86/kernel/aperture_64.c            114             299         381.2
 arch/x86/kernel/aperture_64.c              0             315             0

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>