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.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>