drm/vboxvideo: Make structure vbox_fb_helper_funcs constant

The static structure vbox_fb_helper_funcs, of type drm_fb_helper_funcs,
is used only when it is passed as the third argument to
drm_fb_helper_fbdev_setup(), which does not modify it. Hence make it
constant to protect it from unintended modifications.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <[e-mail]>
Reviewed-by: Hans de Goede <[e-mail]>
Signed-off-by: Hans de Goede <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/vboxvideo/vbox_drv.c

···
 };
 MODULE_DEVICE_TABLE(pci, pciidlist);
 
-static struct drm_fb_helper_funcs vbox_fb_helper_funcs = {
+static const struct drm_fb_helper_funcs vbox_fb_helper_funcs = {
 	.fb_probe = vboxfb_create,
 };