get_cpu_number() doesn't use existing helper to iterate over possible
CPUs, It will cause an error in case of discontinuous @cpu_possible_mask
such as 0b11110001, which can result from a core having failed to come
up on a SMP machine.

Fixed by using existing helper for_each_possible_cpu().
Signed-off-by: Nzijun_hu <zijun_hu@htc.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>