rocker: use PCI_DEVICE() rather than (PCIDevice *) cast

Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
s/resv/rsvd to be consistent

Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
rocker: add DEBUG register name printing

Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>