dt-bindings: mmc: Add support for MT8516 to mtk-sd

Add binding documentation of mtk-sd for MT8516 SoCs.
Signed-off-by: Fabien Parent <fparent@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/mtk-sd.txt

@@ -11,6 +11,7 @@ Required properties:
 	"mediatek,mt8135-mmc": for mmc host ip compatible with mt8135
 	"mediatek,mt8173-mmc": for mmc host ip compatible with mt8173
 	"mediatek,mt8183-mmc": for mmc host ip compatible with mt8183
+	"mediatek,mt8516-mmc": for mmc host ip compatible with mt8516
 	"mediatek,mt2701-mmc": for mmc host ip compatible with mt2701
 	"mediatek,mt2712-mmc": for mmc host ip compatible with mt2712
 	"mediatek,mt7622-mmc": for MT7622 SoC