x86/smp: Reduce code duplication

The CONFIG_X86_32_SMP and CONFIG_X86_64_SMP sections in smp.h contain
duplicate defines.

Merge them and only put the difference into an #ifdeff'ed section.

[ tglx: Massaged changelog ]

Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Cc: jaswinder@infradead.org
Link: http://lkml.kernel.org/r/1491734806-15413-1-git-send-email-douly.fnst@cn.fujitsu.com


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>