dt-bindings: arm64: dts: mediatek: Add mt8195-demo board

Add bindings for the MediaTek mt8195-demo board.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220415150003.1793063-2-fparent@baylibre.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>