mips: xilfpga: fix DTC warnings

This fixes following DTC warning:

arch/mips/dts/nexys4ddr.dtb: Warning (compatible_is_string_list): /ethernet@10e00000/mdio/phy@1:compatible: property is not a string list

As upstream DTS in Linux doesn't have the offending property,
simply remove it to fix the warning.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
1 file changed