drm: the drm really should call pci_set_master..

(submitted upstream as 19a8f59a)

perhaps bonghits could turn on my bus-mastering because the drm
certainly never bothered doing it before.

Signed-off-by: Dave Airlie <airlied@linux.ie>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>