fbdev: efifb: add dev->remove() callback
If x86-sysfb platform-devices are removed from a system, we should properly unload efifb. Otherwise, we end up releasing the parent while our efi framebuffer is still running. This currently works just fine, but will cause problems on handover to real hw. So add the ->remove() callback and unregister efifb. Signed-off-by: NDavid Herrmann <dh.herrmann@gmail.com> Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
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