Changes:
- Add file sys/arm/mv/armada38x/armada38x_mp.c
- Set mp_maxid and mp_ncpus based on FDT unless SCU register indicates only one core
- Boot CPU1 in platform_mp_start_ap():
- Deassert reset signal for CPU1
- IPI range defined
Obtained from: Semihalf
Sponsored by: Stormshield
Submitted by: Michal Stanek <mst@semihalf.com>