arm64: dts: meson: p230: disable advertisement EEE for GbE.

This patch disable EEE advertisement for P230 board (DWMAC + RTL8211F).
If not disable it, the network connection is not stable, will got issues
like throughput drop or broken link.

Signed-off-by: He Yangxuan <yangxuan8282@gmail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>