dt-bindings: clock: Add compatible for D1 DE2 clocks

Allwinner D1 contains a display engine 2.0. Its clock controller
matches the layout of the H5 DE2 clocks (2 mixers, no rotation engine,
and separate resets), so use that compatible as a fallback.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20220411044002.37579-1-samuel@sholland.org