dt-bindings: display: mediatek: dsc: Add MT8188 compatible

Add compatible for Display Stream Compression (DSC) IP found in
the display controller of the MT8188 SoC.

This IP is fully compatible with the one found on MT8195.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20250218090427.20318-1-angelogioacchino.delregno@collabora.com/


Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>