x86: setup_percpu.c fix style problems

Impact: cleanup

Fix:

 WARNING: Use #include <linux/smp.h> instead of <asm/smp.h>
 WARNING: Use #include <linux/percpu.h> instead of <asm/percpu.h>
 WARNING: Use #include <linux/topology.h> instead of <asm/topology.h>
 WARNING: EXPORT_SYMBOL(foo); should immediately follow its function/variable
 ERROR: spaces required around that '?' (ctx:VxW)
 ERROR: spaces required around that ':' (ctx:VxV)

 total: 2 errors, 4 warnings

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>