RDMA: Remove rdma_set_device_sysfs_group()

The driver's device group can be specified as part of the ops structure
like the device's port group. No need for the complicated API.

Link: https://lore.kernel.org/r/8964785a34fd3a29ff5b6693493f575b717e594d.1623427137.git.leonro@nvidia.com
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
diff --git a/drivers/infiniband/hw/qib/qib_verbs.c b/drivers/infiniband/hw/qib/qib_verbs.c
index 8640a75..ef91bff 100644
--- a/drivers/infiniband/hw/qib/qib_verbs.c
+++ b/drivers/infiniband/hw/qib/qib_verbs.c
@@ -1484,6 +1484,7 @@ static const struct ib_device_ops qib_dev_ops = {
 	.driver_id = RDMA_DRIVER_QIB,
 
 	.port_groups = qib_attr_port_groups,
+	.device_group = &qib_attr_group,
 	.modify_device = qib_modify_device,
 	.process_mad = qib_process_mad,
 };
@@ -1612,7 +1613,6 @@ int qib_register_ib_device(struct qib_devdata *dd)
 			      i,
 			      dd->rcd[ctxt]->pkeys);
 	}
-	rdma_set_device_sysfs_group(&dd->verbs_dev.rdi.ibdev, &qib_attr_group);
 
 	ib_set_device_ops(ibdev, &qib_dev_ops);
 	ret = rvt_register_device(&dd->verbs_dev.rdi);