mmc: dt-bindings: add mmc support to MT7623 SoC

Add the devicetree binding for MT7623 SoC using MT2701 as the fallback.

Cc: devicetree@vger.kernel.org
Signed-off-by: NSean Wang <sean.wang@mediatek.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

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

@@ -12,6 +12,8 @@ Required properties:
 	"mediatek,mt8173-mmc": for mmc host ip compatible with mt8173
 	"mediatek,mt2701-mmc": for mmc host ip compatible with mt2701
 	"mediatek,mt2712-mmc": for mmc host ip compatible with mt2712
+	"mediatek,mt7623-mmc", "mediatek,mt2701-mmc": for MT7623 SoC
+
 - reg: physical base address of the controller and length
 - interrupts: Should contain MSDC interrupt number
 - clocks: Should contain phandle for the clock feeding the MMC controller