mediatek: filogic: mt-stuart: fix dtc warnings

Rename the system LED children to led@1..led@4. The nodes have a
reg property, so dtc wants unit addresses. The sysled driver names
the LEDs from the label property, which does not change.

Remove #address-cells and #size-cells from the eMMC card@0 node.
The node has no children with a reg property.

No functional change.

Signed-off-by: Chad Monroe <chad@monroe.io>
Link: https://github.com/openwrt/openwrt/pull/24352
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>

target/linux/mediatek/dts/mt7988a-smartrg-mt-stuart.dtsi

@@ -387,22 +387,22 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 
-		led_sys_red: system_red {
+		led_sys_red: led@1 {
 			label = "red";
 			reg = <1>;
 		};
 
-		led_sys_green: system_green {
+		led_sys_green: led@2 {
 			label = "green";
 			reg = <2>;
 		};
 
-		led_sys_blue: system_blue {
+		led_sys_blue: led@3 {
 			label = "blue";
 			reg = <3>;
 		};
 
-		led_sys_white: system_white {
+		led_sys_white: led@4 {
 			label = "white";
 			reg = <4>;
 		};
@@ -497,8 +497,6 @@
 	#size-cells = <0>;
 
 	card@0 {
-		#address-cells = <0>;
-		#size-cells = <0>;
 		compatible = "mmc-card";
 		reg = <0>;