dt-bindings: clock: axg-aoclkc: New binding for Meson-AXG SoC

Update the dt-binding documentation to support new compatible string
for the Amlogic's Meson-AXG SoC.
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NYixun Lan <yixun.lan@amlogic.com>
Signed-off-by: NJerome Brunet <jbrunet@baylibre.com>

Documentation/devicetree/bindings/clock/amlogic,gxbb-aoclkc.txt

@@ -9,6 +9,7 @@ Required Properties:
 	- GXBB (S905) : "amlogic,meson-gxbb-aoclkc"
 	- GXL (S905X, S905D) : "amlogic,meson-gxl-aoclkc"
 	- GXM (S912) : "amlogic,meson-gxm-aoclkc"
+	- AXG (A113D, A113X) : "amlogic,meson-axg-aoclkc"
 	followed by the common "amlogic,meson-gx-aoclkc"
 
 - #clock-cells: should be 1.