dt-bindings: fsl: scu: add imx8dxl scu clock support

Add imx8dxl scu clock support.

Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20220222082140.2073629-1-abel.vesa@nxp.com

Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt

@@ -86,6 +86,7 @@ This binding uses the common clock binding[1].
 
 Required properties:
 - compatible:		Should be one of:
+			  "fsl,imx8dxl-clk"
 			  "fsl,imx8qm-clk"
 			  "fsl,imx8qxp-clk"
 			followed by "fsl,scu-clk"