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 <rafal@milecki.pl>
Link: https://lore.kernel.org/r/20230724101159.5289-1-zajec5@gmail.comSigned-off-by: Florian Fainelli <florian.fainelli@broadcom.com>

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

@@ -60,3 +60,7 @@ bcm54210e: ethernet-phy@0 {
 		};
 	};
 };
+
+&gmac1 {
+	status = "disabled";
+};

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

@@ -96,3 +96,7 @@ bcm54210e: ethernet-phy@0 {
 		};
 	};
 };
+
+&gmac1 {
+	status = "disabled";
+};