ARM: dts: imx6qdl-tx6: Remove 'turn-on-delay-ms'

The 'turn-on-delay-ms' property is not documented nor used anywhere else.

Remove this invalid property to fix the following dt-schema warning:

Unevaluated properties are not allowed ('turn-on-delay-ms' was unexpected)

Signed-off-by: Fabio Estevam <festevam@denx.de>
Acked-by: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/nxp/imx/imx6dl-tx6dl-comtft.dts

@@ -51,7 +51,6 @@ / {
 
 &backlight {
 	pwms = <&pwm2 0 500000 0>;
-	/delete-property/ turn-on-delay-ms;
 };
 
 &can1 {

arch/arm/boot/dts/nxp/imx/imx6q-tx6q-1010-comtft.dts

@@ -51,7 +51,6 @@ / {
 
 &backlight {
 	pwms = <&pwm2 0 500000 0>;
-	/delete-property/ turn-on-delay-ms;
 };
 
 &can1 {

arch/arm/boot/dts/nxp/imx/imx6q-tx6q-1020-comtft.dts

@@ -51,7 +51,6 @@ / {
 
 &backlight {
 	pwms = <&pwm2 0 500000 0>;
-	/delete-property/ turn-on-delay-ms;
 };
 
 &can1 {

arch/arm/boot/dts/nxp/imx/imx6qdl-tx6-lcd.dtsi

@@ -51,7 +51,6 @@ backlight: backlight {
 		pinctrl-0 = <&pinctrl_lcd1_pwr>;
 		enable-gpios = <&gpio2 31 GPIO_ACTIVE_HIGH>;
 		power-supply = <&reg_3v3>;
-		turn-on-delay-ms = <35>;
 		/*
 		 * a poor man's way to create a 1:1 relationship between
 		 * the PWM value and the actual duty cycle

arch/arm/boot/dts/nxp/imx/imx6qdl-tx6-mb7.dtsi

@@ -42,13 +42,11 @@
 / {
 	backlight0 {
 		pwms = <&pwm1 0 500000 PWM_POLARITY_INVERTED>;
-		turn-on-delay-ms = <35>;
 		power-supply = <&reg_lcd1_pwr>;
 	};
 
 	backlight1 {
 		pwms = <&pwm2 0 500000 PWM_POLARITY_INVERTED>;
-		turn-on-delay-ms = <35>;
 		power-supply = <&reg_lcd1_pwr>;
 	};