scsi: pm80xx: Use dev_parent_is_expander() helper

Make use of the dev_parent_is_expander() helper.

Signed-off-by: Niklas Cassel <cassel@kernel.org>
Link: https://lore.kernel.org/r/20250814173215.1765055-19-cassel@kernel.org


Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Igor Pylypiv <ipylypiv@google.com>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>