We are saving pointer to iommu DT node in of_iommu_set_ops()
hence we should increment DT node ref count.
Reviewed-by: NRay Jui <rjui@broadcom.com>
Reviewed-by: NScott Branden <sbranden@broadcom.com>
Reviewed-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NAnup Patel <anup.patel@broadcom.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>