drm/vboxvideo: Add PCI region request

vboxvideo currently does not reserve its PCI BAR through a region request.

Implement the request through the managed function pcim_request_region().

Link: https://lore.kernel.org/r/20240729093625.17561-5-pstanner@redhat.com
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>

Author: Philipp Stanner

drivers/gpu/drm/vboxvideo/vbox_main.c

@@ -114,6 +114,10 @@ int vbox_hw_init(struct vbox_private *vbox)
 
 	DRM_INFO("VRAM %08x\n", vbox->full_vram_size);
 
+	ret = pcim_request_region(pdev, 0, "vboxvideo");
+	if (ret)
+		return ret;
+
 	/* Map guest-heap at end of vram */
 	vbox->guest_heap = pcim_iomap_range(pdev, 0,
 			GUEST_HEAP_OFFSET(vbox), GUEST_HEAP_SIZE);