dt-bindings: arm: imx: scu: fix naming typo of clk compatible string

There is a typo in binding doc that the name of compatible string of
scu clock should be "fsl,xxx-clk" rather than "fsl,xxx-clock".
In reality, both example and dts using "fsl,xxx-clk", so fixing the doc
is enough.

Cc: [e-mail]
Signed-off-by: Dong Aisheng <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Signed-off-by: Abel Vesa <[e-mail]>

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

···
 
 Required properties:
 - compatible:		Should be one of:
-			  "fsl,imx8qm-clock"
-			  "fsl,imx8qxp-clock"
+			  "fsl,imx8qm-clk"
+			  "fsl,imx8qxp-clk"
 			followed by "fsl,scu-clk"
 - #clock-cells:		Should be either
 			2: Contains the Resource and Clock ID value.