Input: drv260x - fix binding document

Update the drv260x dt binding document:
- Change the node name to the devices function not the device name.
- Add vbat-supply to the example.
- Fix indentation of the example.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --cc Documentation/devicetree/bindings/input/ti,drv260x.txt
Simple merge