dt-bindings: remoteproc: mediatek: Add binding for mt8188 scp

Add the compatible for mt8188 SCP to the binding.

Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220715051821.30707-2-tinghan.shen@mediatek.com


Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>