powerpc/powernv/iov: Don't add VFs to iommu group during PE config

In pnv_ioda_setup_vf_PE() we register an iommu group for the VF PE
then call pnv_ioda_setup_bus_iommu_group() to add devices to that group.
However, this function is called before the VFs are scanned so there's
no devices to add.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200406030745.24595-3-oohall@gmail.com

arch/powerpc/platforms/powernv/pci-ioda.c

@@ -1622,7 +1622,6 @@ static void pnv_ioda_setup_vf_PE(struct pci_dev *pdev, u16 num_vfs)
 #ifdef CONFIG_IOMMU_API
 		iommu_register_group(&pe->table_group,
 				pe->phb->hose->global_number, pe->pe_number);
-		pnv_ioda_setup_bus_iommu_group(pe, &pe->table_group, NULL);
 #endif
 	}
 }