dt-bindings: display: mediatek: update dsi supported chips

Update device tree binding documentation for the dsi for
Mediatek MT8183 SoCs.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: CK Hu <ck.hu@mediatek.com>