dt-bindings: net: nxp,dwmac-imx: allow nvmem cells property

Allow nvmem-cells and nvmem-cell-names to get mac_address from onchip
fuse.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240415103621.1644735-1-peng.fan@oss.nxp.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/devicetree/bindings/net/nxp,dwmac-imx.yaml

@@ -66,6 +66,10 @@ properties:
       Should be phandle/offset pair. The phandle to the syscon node which
       encompases the GPR register, and the offset of the GPR register.
 
+  nvmem-cells: true
+
+  nvmem-cell-names: true
+
   snps,rmii_refclk_ext:
     $ref: /schemas/types.yaml#/definitions/flag
     description: