dt-bindings: input: touchscreen: Use generic node name

Node names should be generic.

Improve the binding example by using 'touchscreen' as the node name.

Signed-off-by: Fabio Estevam <[e-mail]>
Acked-by: Rob Herring (Arm) <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Torokhov <[e-mail]>

Documentation/devicetree/bindings/input/touchscreen/azoteq,iqs7211.yaml

···
             #address-cells = <1>;
             #size-cells = <0>;
 
-            touch@56 {
+            touchscreen@56 {
                     compatible = "azoteq,iqs7210a";
                     reg = <0x56>;
                     irq-gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
···
             #address-cells = <1>;
             #size-cells = <0>;
 
-            touch@56 {
+            touchscreen@56 {
                     compatible = "azoteq,iqs7211e";
                     reg = <0x56>;
                     irq-gpios = <&gpio 4 (GPIO_ACTIVE_LOW |

Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml

···
     i2c {
       #address-cells = <1>;
       #size-cells = <0>;
-      edt-ft5x06@38 {
+      touchscreen@38 {
         compatible = "edt,edt-ft5406";
         reg = <0x38>;
         interrupt-parent = <&gpio2>;

Documentation/devicetree/bindings/input/touchscreen/goodix.yaml

···
     i2c {
       #address-cells = <1>;
       #size-cells = <0>;
-      gt928@5d {
+      touchscreen@5d {
         compatible = "goodix,gt928";
         reg = <0x5d>;
         interrupt-parent = <&gpio>;