Input: edt-ft5x06 - document wakeup-source capability

The current driver behaviour was to enable the wakeup-source everytime.
After discussion [1] we decided to change that behaviour so the device
will act as wakeup-source only if the "wakeup-source" dt-property is
present.

The patch adds the binding documentation to enable the wakeup-source
capability.

[1] https://patchwork.kernel.org/patch/11149037/

Signed-off-by: Marco Felsch <[email protected]>
Tested-by: Andy Shevchenko <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>

Author: Marco Felsch

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

@@ -36,6 +36,8 @@ Optional properties:
  - pinctrl-0:   a phandle pointing to the pin settings for the
                 control gpios
 
+ - wakeup-source: If present the device will act as wakeup-source
+
  - threshold:   allows setting the "click"-threshold in the range
                 from 0 to 80.