realtek: fixup Datto L8 device tree

ports should be ethernet-ports, otherwise initialising ethernet
ports fails on 6.18 testing kernel.

Signed-off-by: Hal Martin <hal.martin@gmail.com>
Link: openwrt/openwrt#22764
Signed-off-by: Robert Marko <robimarko@gmail.com>

Author: halmartin

target/linux/realtek/dts/rtl8380_datto_l8.dts

@@ -129,7 +129,7 @@
 };
 
 &switch0 {
-	ports {
+	ethernet-ports {
 		#address-cells = <1>;
 		#size-cells = <0>;