documentation: arm: sunxi: add Allwinner H6 documents

Add the current Allwinner H6 datasheet and user manual.
Signed-off-by: Wilken Gottwalt <wilken.gottwalt@linux-addicted.net>
Link: https://lore.kernel.org/r/20201027062408.GA6761@monster.powergraphx.localSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/arm/sunxi.rst

@@ -148,3 +148,13 @@ SunXi family
         * User Manual
 
           http://dl.linux-sunxi.org/A64/Allwinner%20A64%20User%20Manual%20v1.0.pdf
+
+      - Allwinner H6
+
+	* Datasheet
+
+	  https://linux-sunxi.org/images/5/5c/Allwinner_H6_V200_Datasheet_V1.1.pdf
+
+	* User Manual
+
+	  https://linux-sunxi.org/images/4/46/Allwinner_H6_V200_User_Manual_V1.1.pdf