kernel: SMP: allow more than 5 CPU cores

Previously we limit maximum number of CPU cores to 5, now be
bumping this restriction so we can use 12 cores.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Evgeniy Paltsev <PaltsevEvgeniy@gmail.com>