HiHope RZG2[HMN] boards uses Realtek phy and the driver does not support
rxc-skew-ps property. So remove rxc-skew-ps from ethernet-phy node.

Fixes: 7433f1fb ("arm64: dts: renesas: Add HiHope RZ/G2M sub board support")
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20201015132350.8360-1-biju.das.jz@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>