dt-bindings: gpu: mali-bifrost: Add new MT8183 compatible

Since new platform data was required in Panfrost for getting GPU DVFS
finally working on MediaTek SoCs, add a new "mediatek,mt8183b-mali"
compatible.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230316102041.210269-6-angelogioacchino.delregno@collabora.com