ARM: dts: mediatek: Add compatible property for aquaris5

Add the missing 'compatible' property to device tree root node of

 - mt6589-aquaris5.dts

and document the new values.
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

Documentation/devicetree/bindings/arm/mediatek.txt

@@ -6,3 +6,9 @@ Required root node property:
 
 compatible: must contain "mediatek,mt6589"
 
+
+Supported boards:
+
+- bq Aquaris5 smart phone:
+    Required root node properties:
+      - compatible = "mundoreader,bq-aquaris5", "mediatek,mt6589";

arch/arm/boot/dts/mt6589-aquaris5.dts

@@ -18,6 +18,7 @@
 
 / {
 	model = "bq Aquaris5";
+	compatible = "mundoreader,bq-aquaris5", "mediatek,mt6589";
 
 	chosen {
 		bootargs = "earlyprintk";