Setting the affinity of an IRQ, it only applicable for the root
interrupt controller and so only populate this operator for the root
controller.
Acked-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NJon Hunter <jonathanh@nvidia.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>