arm64: dts: Add mediatek SoC mt8195 and evaluation board

Add basic chip support for mediatek mt8195.

Signed-off-by: Seiya Wang <seiya.wang@mediatek.com>
Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220411022724.11005-3-tinghan.shen@mediatek.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>