kernel/reboot.c: convert simple_strtoul to kstrtoint

Replace obsolete function.
kstrtoint is used as reboot_cpu is an integer.

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>