ARM: dts: BCM53573: Disable second Ethernet on Luxul devices

XAP-810 and XAP-1440 both have a single Ethernet port and BCM54210E PHY.
Their second Ethernet interface is not connected to anything.

Signed-off-by: Rafał Miłecki <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Florian Fainelli <[e-mail]>

arch/arm/boot/dts/broadcom/bcm47189-luxul-xap-1440.dts

···
 		};
 	};
 };
+
+&gmac1 {
+	status = "disabled";
+};

arch/arm/boot/dts/broadcom/bcm47189-luxul-xap-810.dts

···
 		};
 	};
 };
+
+&gmac1 {
+	status = "disabled";
+};