fsl_qbman: remove reference to archdata.iommu_domain for v5.9

commit b69fcc089c65e79d770e1ffcbcc43e1ec2170c70 from
git://source.codeaurora.org/external/qoriq/qoriq-components/linux

The dev->archdata.iommu_domain was removed in upstream kernel v5.9
in commit 6255c8c8

 ("powerpc/dma: Remove dev->archdata.iommu_domain").

Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
Signed-off-by: Meng Li <Meng.Li@windriver.com>