lantiq: adapt upstream commit to some dts files

Some lantiq dts files still use etop but 6.12.45[1] changed to ethernet
so bring them into parity with this change.

1. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.12.y&id=8c431ea8f3f795c4b9cfa57a85bc4166b9cce0ac

Co-Authored-by: Hauke Mehrtens <[email protected]>
Co-Authored-by: Aleksander Bajkowski <[email protected]>
Signed-off-by: John Audia <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19956
Signed-off-by: Hauke Mehrtens <[email protected]>
(cherry picked from commit c55a411af2f2443e3face3f895d2c0a2f0bfc135)

target/linux/lantiq/files/arch/mips/boot/dts/lantiq/amazonse.dtsi

@@ -229,7 +229,7 @@
 			interrupts = <85>;
 		};
 
-		gsw: etop@e180000 {
+		gsw: ethernet@e180000 {
 			compatible = "lantiq,etop-xway";
 			reg = <0xe180000 0x40000>;
 			interrupt-parent = <&icu0>;

target/linux/lantiq/files/arch/mips/boot/dts/lantiq/ar9.dtsi

@@ -379,7 +379,7 @@
 			interrupts = <63 61 68>;
 		};
 
-		gsw: etop@e180000 {
+		gsw: ethernet@e180000 {
 			compatible = "lantiq,etop-xway";
 			reg = <0xe180000 0x40000
 				0xe108000 0x200>;

target/linux/lantiq/files/arch/mips/boot/dts/lantiq/danube.dtsi

@@ -294,7 +294,7 @@
 			interrupts = <63 61 159>;
 		};
 
-		gsw: etop@e180000 {
+		gsw: ethernet@e180000 {
 			compatible = "lantiq,etop-xway";
 			reg = <0xe180000 0x40000>;
 			interrupt-parent = <&icu0>;