ARM: dts: imx7d-zii-rmu2: fix Ethernet PHY pinctrl property

There is no "fsl,phy" property in pin controller pincfg nodes:

  imx7d-zii-rmu2.dtb: pinctrl@302c0000: enet1phyinterruptgrp: 'fsl,pins' is a required property
  imx7d-zii-rmu2.dtb: pinctrl@302c0000: enet1phyinterruptgrp: 'fsl,phy' does not match any of the regexes: 'pinctrl-[0-9]+'

Fixes: f496e675 ("ARM: dts: Add ZII support for ZII i.MX7 RMU2 board")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>