arm64: dts: Add MediaTek MT8188 dts and evaluation board and Makefile

MT8188 is a SoC based on 64bit ARMv8 architecture. It contains 6 CA55
and 2 CA78 cores. MT8188 share many HW IP with MT65xx series.

We add basic chip support for MediaTek MT8188 on evaluation board.

Signed-off-by: jason-ch chen <Jason-ch.Chen@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
Link: https://lore.kernel.org/r/20231023083839.24453-5-jason-ch.chen@mediatek.com
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>