MLK-20683 arm64: dts: imx8qm-mek: add AR8031 daughter board support

By default, i.MX8QM MEK base board support NXP tja1100 PHY by load
the dts file: fsl-imx8qm-mek-enet2-tja1100.dts
In fact, the MEK base board also support AR8031 daughter board. So
enable the PHY in default dts.

Reviewed-by: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>

arch/arm64/boot/dts/freescale/fsl-imx8qm-mek.dtsi

@@ -759,7 +759,6 @@
 			reg = <1>;
 			at803x,eee-disabled;
 			at803x,vddio-1p8v;
-			status = "disabled";
 		};
 	};
 };