arm64: dts: qcom: sc7180-trogdor: add function to LED node

Add common LED property - the function - to LED node.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220607102931.102805-8-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi

@@ -8,6 +8,7 @@
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/input/gpio-keys.h>
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
 #include <dt-bindings/regulator/qcom,rpmh-regulator.h>
 #include <dt-bindings/sound/sc7180-lpass.h>
 
@@ -356,6 +357,7 @@ pwmleds {
 		keyboard_backlight: keyboard-backlight {
 			status = "disabled";
 			label = "cros_ec::kbd_backlight";
+			function = LED_FUNCTION_KBD_BACKLIGHT;
 			pwms = <&cros_ec_pwm 0>;
 			max-brightness = <1023>;
 		};