drm: Move struct drm_device.pdev to legacy section

Struct drm_device.pdev is being moved to legacy status as only legacy
DRM drivers use it. A possible follow-up patchset could remove pdev
entirely.

v4:
	* rebased
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210429105101.25667-6-tzimmermann@suse.de

include/drm/drm_device.h

@@ -279,9 +279,6 @@ struct drm_device {
 	/** @agp: AGP data */
 	struct drm_agp_head *agp;
 
-	/** @pdev: PCI device structure */
-	struct pci_dev *pdev;
-
 	/** @num_crtcs: Number of CRTCs on this device */
 	unsigned int num_crtcs;
 
@@ -324,6 +321,9 @@ struct drm_device {
 	/* List of devices per driver for stealth attach cleanup */
 	struct list_head legacy_dev_list;
 
+	/* PCI device structure */
+	struct pci_dev *pdev;
+
 #ifdef __alpha__
 	/** @hose: PCI hose, only used on ALPHA platforms. */
 	struct pci_controller *hose;