fix(drm): add privacy screen modules to the initrd

fix(drm): add privacy screen modules to the initrd

Starting with kernel 5.17 the kernel supports the builtin privacy screens
built into the LCD panel of some new laptop models.

This means that the drm drivers will now return -EPROBE_DEFER from their
probe() method on models with a builtin privacy screen when the privacy
screen provider driver has not been loaded yet.

Make dracut add the privacy screen providing drivers to the initrd
(when necessary for hostmode=yes), so that drm drivers on affected
drivers can probe() successfully.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>