Document: DT: Add bindings for mediatek MT7623 SoC Platform

This adds a DT binding documentation for the MT7623 SoC from Mediatek.

Signed-off-by: John Crispin <[e-mail]>
Cc: [e-mail]
Signed-off-by: Matthias Brugger <[e-mail]>

Documentation/devicetree/bindings/arm/mediatek.txt

···
    "mediatek,mt6589"
    "mediatek,mt6592"
    "mediatek,mt6795"
+   "mediatek,mt7623"
    "mediatek,mt8127"
    "mediatek,mt8135"
    "mediatek,mt8173"
···
 - Evaluation board for MT6795(Helio X10):
     Required root node properties:
       - compatible = "mediatek,mt6795-evb", "mediatek,mt6795";
+- Evaluation board for MT7623:
+    Required root node properties:
+      - compatible = "mediatek,mt7623-evb", "mediatek,mt7623";
 - MTK mt8127 tablet moose EVB:
     Required root node properties:
       - compatible = "mediatek,mt8127-moose", "mediatek,mt8127";

Documentation/devicetree/bindings/serial/mtk-uart.txt

···
   * "mediatek,mt6582-uart" for MT6582 compatible UARTS
   * "mediatek,mt6589-uart" for MT6589 compatible UARTS
   * "mediatek,mt6795-uart" for MT6795 compatible UARTS
+  * "mediatek,mt7623-uart" for MT7623 compatible UARTS
   * "mediatek,mt8127-uart" for MT8127 compatible UARTS
   * "mediatek,mt8135-uart" for MT8135 compatible UARTS
   * "mediatek,mt8173-uart" for MT8173 compatible UARTS

Documentation/devicetree/bindings/timer/mediatek,mtk-timer.txt

···
 	* "mediatek,mt2701-timer" for MT2701 compatible timers
 	* "mediatek,mt6580-timer" for MT6580 compatible timers
 	* "mediatek,mt6589-timer" for MT6589 compatible timers
+	* "mediatek,mt7623-timer" for MT7623 compatible timers
 	* "mediatek,mt8127-timer" for MT8127 compatible timers
 	* "mediatek,mt8135-timer" for MT8135 compatible timers
 	* "mediatek,mt8173-timer" for MT8173 compatible timers