linux-dmabuf: send protocol error on invalid format/modifier

Now that compositors must send INVALID to advertise support for
implicit modifiers, we can make it a protocol error to add a
DMA-BUF plane with an unsupported format + modifier pair.

Signed-off-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Daniel Stone <daniels@collabora.com>
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