[AGPGART] Set .owner field of struct pci_driver.

From: Laurent Riffard <laurent.riffard@free.fr>

This updates .owner field of struct pci_driver.

This allows SYSFS to create the symlink from the driver to the module which
provides it.

$ tree /sys/bus/pci/drivers/agpgart-via/
/sys/bus/pci/drivers/agpgart-via/
|-- 0000:00:00.0 -> ../../../../devices/pci0000:00/0000:00:00.0
|-- bind
|-- module -> ../../../../module/via_agp
|-- new_id
`-- unbind

Signed-off-by: Laurent Riffard <laurent.riffard@free.fr>
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>