dt-bindings: arm: amlogic: add libretech aml-s805x-ac bindings

Add bindings for the Libretech aml-s805x-ac board, aka 'La Frite'.
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Signed-off-by: NJerome Brunet <jbrunet@baylibre.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NKevin Hilman <khilman@baylibre.com>

Documentation/devicetree/bindings/arm/amlogic.txt

@@ -94,6 +94,7 @@ Board compatible values (alphabetically, grouped by SoC):
   - "phicomm,n1" (Meson gxl s905d)
 
   - "amlogic,p241" (Meson gxl s805x)
+  - "libretech,aml-s805x-ac" (Meson gxl s805x)
 
   - "amlogic,p281" (Meson gxl s905w)
   - "oranth,tx3-mini" (Meson gxl s905w)