"usb-nop-xceiv" is using the phy binding, but is missing #phy-cells
property. This is probably because the binding was the precursor to the phy
binding.

Fixes the following warning in Marvell dts files:

Warning (phys_property): Missing property '#phy-cells' in node ...
Signed-off-by: NRob Herring <robh@kernel.org>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Acked-by: NGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>