arm64: dts: apm: storm: Rename menetphy@3 to ethernet-phy@3

arm64: dts: apm: storm: Rename menetphy@3 to ethernet-phy@3

Make the PHY node name adhere to DT binding document.
Fix the following DT check error:

arch/arm64/boot/dts/apm/apm-mustang.dtb: menetphy@3: $nodename:0: 'menetphy@3' does not match '^ethernet-phy(@[a-f0-9]+)?$'
        from schema $id: http://devicetree.org/schemas/net/realtek,rtl82xx.yaml#
arch/arm64/boot/dts/apm/apm-mustang.dtb: menetphy@3: Unevaluated properties are not allowed ('reg' was unexpected)
        from schema $id: http://devicetree.org/schemas/net/realtek,rtl82xx.yaml#

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202406290316.YvZdvLxu-lkp@intel.com/
Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20240630033143.170301-1-marex@denx.de
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>