Documentation: arm64: Add Hisilicon Hip06 D03 dts binding

This patch adds documentation for the devicetree bindings used by
the DT files of Hisilicon Hip06 D03 board.

Meanwhile, reorder the soc/board name alphabetically.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt

 Hisilicon Platforms Device Tree Bindings
 ----------------------------------------------------
-Hi6220 SoC
-Required root node properties:
-	- compatible = "hisilicon,hi6220";
-
 Hi4511 Board
 Required root node properties:
 	- compatible = "hisilicon,hi3620-hi4511";
 
-HiP04 D01 Board
+Hi6220 SoC
 Required root node properties:
-	- compatible = "hisilicon,hip04-d01";
+	- compatible = "hisilicon,hi6220";
+
+HiKey Board
+Required root node properties:
+	- compatible = "hisilicon,hi6220-hikey", "hisilicon,hi6220";
 
 HiP01 ca9x2 Board
 Required root node properties:
 	- compatible = "hisilicon,hip01-ca9x2";
 
-HiKey Board
+HiP04 D01 Board
 Required root node properties:
-	- compatible = "hisilicon,hi6220-hikey", "hisilicon,hi6220";
+	- compatible = "hisilicon,hip04-d01";
 
 HiP05 D02 Board
 Required root node properties:
 	- compatible = "hisilicon,hip05-d02";
 
+HiP06 D03 Board
+Required root node properties:
+	- compatible = "hisilicon,hip06-d03";
+
 Hisilicon system controller
 
 Required properties: