Fix the leds subnode names to match (^led-[0-9a-f]$|led).
Similar change has been also done by commit 
9a19a39ee48b ("arm64: dts:
zynqmp: Fix leds subnode name for zcu100/ultra96 v1").
The patch is fixing these warnings:
.../zynq-zc702.dt.yaml: leds: 'ds23' does not match any of the regexes:
'(^led-[0-9a-f]$|led)', 'pinctrl-[0-9]+'
>From schema: .../Documentation/devicetree/bindings/leds/leds-gpio.yaml
.../zynq-zybo-z7.dt.yaml: gpio-leds: 'ld4' does not match any of the
regexes: '(^led-[0-9a-f]$|led)', 'pinctrl-[0-9]+'
>From schema: .../Documentation/devicetree/bindings/leds/leds-gpio.yaml
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/607a66783b129294364abf09a6fc8abd241ff4ee.1606397101.git.michal.simek@xilinx.com
        leds {
                compatible = "gpio-leds";
 
-               ds23 {
+               led-ds23 {
                        label = "ds23";
                        gpios = <&gpio0 10 0>;
                        linux,default-trigger = "heartbeat";
 
        gpio-leds {
                compatible = "gpio-leds";
 
-               ld4 {
+               led-ld4 {
                        label = "zynq-zybo-z7:green:ld4";
                        gpios = <&gpio0 7 GPIO_ACTIVE_HIGH>;
                };