Documentation: arm64: Add Hisilicon Hip07 D05 dts binding

This patch adds documentation for the devicetree bindings used by
the DT files of Hisilicon Hip07 D05 board.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

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

@@ -28,6 +28,10 @@ HiP06 D03 Board
 Required root node properties:
 	- compatible = "hisilicon,hip06-d03";
 
+HiP07 D05 Board
+Required root node properties:
+	- compatible = "hisilicon,hip07-d05";
+
 Hisilicon system controller
 
 Required properties: