arm64: dts: imx8mp: Drop Atheros PHY header from i.MX8M Plus DHCOM PDK2

This PHY is not used on PDK2, the header was added due to copy-paste
error, drop it.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@denx.de>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Shawn Guo <shawnguo@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp-dhcom-pdk2.dts

@@ -11,7 +11,6 @@
 /dts-v1/;
 
 #include <dt-bindings/leds/common.h>
-#include <dt-bindings/net/qca-ar803x.h>
 #include <dt-bindings/phy/phy-imx8-pcie.h>
 #include "imx8mp-dhcom-som.dtsi"