arm64: dts: imx8mp: Drop i.MX8MP DHCOM rev.100 PHY address workaround from PDK3 DT

In case the i.MX8MP DHCOM rev.100 has been populated on the PDK3
carrier board, the on-SoM PHY PHYAD1 signal has been pulled high
by the carrier board and changed the PHY MDIO address from 5 to 7.
This has been fixed on production rev.200 SoM by additional buffer
on the SoM PHYAD/LED signals, remove the workaround.

Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/arch/arm/dts/imx8mp-dhcom-pdk3.dts b/arch/arm/dts/imx8mp-dhcom-pdk3.dts
index c5f0607..867d238 100644
--- a/arch/arm/dts/imx8mp-dhcom-pdk3.dts
+++ b/arch/arm/dts/imx8mp-dhcom-pdk3.dts
@@ -227,10 +227,6 @@
 	};
 };
 
-&ethphy0g {
-	reg = <7>;
-};
-
 &fec {	/* Second ethernet */
 	pinctrl-0 = <&pinctrl_fec_rgmii>;
 	phy-handle = <&ethphypdk>;