xilinx-ml507: Add screen option and don't disable tty1
xilinx-ml507: Add screen option and don't disable tty1

Signed-off-by: Adrian Alonso <bdfc8ce71cae6b28eb5b9733635e46bc81c8832e@gmail.com>
Signed-off-by: Stefan Schmidt <eb0877843acc39f8ef6f7269937dee931c372d23@datenfreihafen.org>

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