dt-bindings: arm: amlogic: Add Meson AXG binding

Introduce new bindings for the Meson AXG SoC which now have
different memory layout.
Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Documentation/devicetree/bindings/arm/amlogic.txt

@@ -41,6 +41,10 @@ Boards with the Amlogic Meson GXM S912 SoC shall have the following properties:
   Required root node property:
     compatible: "amlogic,s912", "amlogic,meson-gxm";
 
+Boards with the Amlogic Meson AXG A113D SoC shall have the following properties:
+  Required root node property:
+    compatible: "amlogic,a113d", "amlogic,meson-axg";
+
 Board compatible values (alphabetically, grouped by SoC):
 
   - "geniatech,atv1200" (Meson6)
@@ -76,6 +80,8 @@ Board compatible values (alphabetically, grouped by SoC):
   - "nexbox,a1" (Meson gxm s912)
   - "tronsmart,vega-s96" (Meson gxm s912)
 
+  - "amlogic,s400" (Meson axg a113d)
+
 Amlogic Meson Firmware registers Interface
 ------------------------------------------