[PATCH] make kernels with CONFIG_X86_GENERIC and !CONFIG_SMP compilable

CONFIG_X86_GENERIC is not exclusively CONFIG_SMP, as mach-default/ could
be compiled also for UP archs. The patch fixes compilation error in
include/asm/mach-summit/mach_apic.h in case CONFIG_X86_GENERIC && !CONFIG_SMP

Signed-off-by: Jiri Kosina <jikos@jikos.cz>
Acked-by: Keith Mannthey <kmannth@us.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>