ARM64: dts: meson-gx: remove the phy-mode property from meson-gx

The ethmac node has to be configured for each board due to different
pinctrl nodes for RGMII/RMII. Thus the phy-mode should be specified at
the same place (= in the board .dts), making it easier to read the board
.dts file (because the phy-mode is stated explicitly, without requiring
developers to read all "parent" .dtsi as well).
Signed-off-by: NMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: NJerome Brunet <jbrunet@baylibre.com>
Signed-off-by: NKevin Hilman <khilman@baylibre.com>

arch/arm64/boot/dts/amlogic/meson-gx.dtsi

@@ -410,7 +410,6 @@
 			       0x0 0xc8834540 0x0 0x4>;
 			interrupts = <0 8 1>;
 			interrupt-names = "macirq";
-			phy-mode = "rgmii";
 			status = "disabled";
 		};