[POWERPC] Fix cut and paste breakage in arch/powerpc/platforms/pseries/pseries.h

My "cleanup" patch (dce623e0

) had a cut
and paste error for the !CONFIG_KEXEC case. Fifty lashes for me.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>