dt-bindings: usb: dwc3-imx8mp: dma-range is required only for imx8mp

Only i.MX8MP need dma-range property to let USB controller work properly.
Remove dma-range from required list and add limitation for imx8mp.

Fixes: d2a704e29711 ("dt-bindings: usb: dwc3-imx8mp: add imx8mp dwc3 glue bindings")
Cc: stable <[e-mail]>
Reviewed-by: Jun Li <[e-mail]>
Signed-off-by: Xu Yang <[e-mail]>
Reviewed-by: Frank Li <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/devicetree/bindings/usb/fsl,imx8mp-dwc3.yaml

···
   - reg
   - "#address-cells"
   - "#size-cells"
-  - dma-ranges
   - ranges
   - clocks
   - clock-names
   - interrupts
   - power-domains
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          const: fsl,imx8mp-dwc3
+    then:
+      required:
+        - dma-ranges
 
 additionalProperties: false