Document: DT: Add bindings for mediatek MT6795 SoC Platform

This adds DT binding documentation for Mediatek MT6795.
Signed-off-by: Mars Cheng <mars.cheng@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

Documentation/devicetree/bindings/arm/mediatek.txt

-MediaTek mt65xx & mt81xx Platforms Device Tree Bindings
+MediaTek mt65xx, mt67xx & mt81xx Platforms Device Tree Bindings
 
-Boards with a MediaTek mt65xx/mt81xx SoC shall have the following property:
+Boards with a MediaTek mt65xx/mt67xx/mt81xx SoC shall have the
+following property:
 
 Required root node property:
 
 compatible: Must contain one of
    "mediatek,mt6589"
    "mediatek,mt6592"
+   "mediatek,mt6795"
    "mediatek,mt8127"
    "mediatek,mt8135"
    "mediatek,mt8173"
@@ -20,6 +22,9 @@ Supported boards:
 - Evaluation board for MT6592:
     Required root node properties:
       - compatible = "mediatek,mt6592-evb", "mediatek,mt6592";
+- Evaluation board for MT6795(Helio X10):
+    Required root node properties:
+      - compatible = "mediatek,mt6795-evb", "mediatek,mt6795";
 - MTK mt8127 tablet moose EVB:
     Required root node properties:
       - compatible = "mediatek,mt8127-moose", "mediatek,mt8127";

Documentation/devicetree/bindings/arm/mediatek/mediatek,sysirq.txt

-Mediatek 65xx/81xx sysirq
++Mediatek 65xx/67xx/81xx sysirq
 
 Mediatek SOCs sysirq support controllable irq inverter for each GIC SPI
 interrupt.
@@ -8,6 +8,7 @@ Required properties:
 	"mediatek,mt8173-sysirq"
 	"mediatek,mt8135-sysirq"
 	"mediatek,mt8127-sysirq"
+	"mediatek,mt6795-sysirq"
 	"mediatek,mt6592-sysirq"
 	"mediatek,mt6589-sysirq"
 	"mediatek,mt6582-sysirq"

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

@@ -5,10 +5,11 @@ Required properties:
   * "mediatek,mt8135-uart" for MT8135 compatible UARTS
   * "mediatek,mt8127-uart" for MT8127 compatible UARTS
   * "mediatek,mt8173-uart" for MT8173 compatible UARTS
+  * "mediatek,mt6795-uart" for MT6795 compatible UARTS
   * "mediatek,mt6589-uart" for MT6589 compatible UARTS
   * "mediatek,mt6582-uart" for MT6582 compatible UARTS
-  * "mediatek,mt6577-uart" for all compatible UARTS (MT8173, MT6589, MT6582, 
-	MT6577)
+  * "mediatek,mt6577-uart" for all compatible UARTS (MT8173, MT6795, MT6589,
+	MT6582, MT6577)
 
 - reg: The base address of the UART register bank.