powerpc: Call no-longer static setup_nr_cpu_ids instead of replicating it

powerpc: Call no-longer static setup_nr_cpu_ids instead of replicating it

7896e4f4dd4ce85e11edf1dc3946d86ce0a84d6e (powerpc: Set nr_cpu_ids early
and use it to free PACAs) copied the formerly static setup_nr_cpu_ids
from init/main.c but 5ded6a7f741401ea46ad7320df096aa3cecd614a (smp:
move smp setup functions to kernel/smp.c) moved it to kernel/smp.c
with a declaration in include/linux/smp.h, so we can call it instead of
replicating it.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>