drm/virtgpu: Remove references to struct drm_device.pdev

Using struct drm_device.pdev is deprecated. Convert virtgpu to struct
drm_device.dev. No functional changes.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201201103542.2182-19-tzimmermann@suse.de

drivers/gpu/drm/virtio/virtgpu_drv.c

@@ -54,7 +54,6 @@ static int virtio_gpu_pci_quirk(struct drm_device *dev, struct virtio_device *vd
 	DRM_INFO("pci: %s detected at %s\n",
 		 vga ? "virtio-vga" : "virtio-gpu-pci",
 		 pname);
-	dev->pdev = pdev;
 	if (vga)
 		drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
 								  "virtiodrmfb");