dt-bindings: display: remove backlight node from panel examples

The examples for these panel drivers have a backlight node in addition to
the actual panel node. However the exact backlight is outside the scope of
this binding and should be dropped from the example.

Link: https://lore.kernel.org/linux-devicetree/20230724143152.GA3430423-robh@kernel.org/Suggested-by: Rob Herring <robh@kernel.org>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Acked-by: David Lechner <david@lechnology.com>
Link: https://lore.kernel.org/r/20231011-dt-panel-example-no-backlight-v1-1-b81618d32752@bootlin.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/display/ilitek,ili9486.yaml

@@ -50,10 +50,6 @@ examples:
   - |
     #include <dt-bindings/gpio/gpio.h>
 
-    backlight: backlight {
-            compatible = "gpio-backlight";
-            gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
-    };
     spi {
             #address-cells = <1>;
             #size-cells = <0>;

Documentation/devicetree/bindings/display/panel/ilitek,ili9163.yaml

@@ -48,10 +48,6 @@ examples:
   - |
     #include <dt-bindings/gpio/gpio.h>
 
-    backlight: backlight {
-            compatible = "gpio-backlight";
-            gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
-    };
     spi {
             #address-cells = <1>;
             #size-cells = <0>;

Documentation/devicetree/bindings/display/sitronix,st7735r.yaml

@@ -54,11 +54,6 @@ examples:
   - |
     #include <dt-bindings/gpio/gpio.h>
 
-    backlight: backlight {
-            compatible = "gpio-backlight";
-            gpios = <&gpio 44 GPIO_ACTIVE_HIGH>;
-    };
-
     spi {
             #address-cells = <1>;
             #size-cells = <0>;