dt-binding: input: egalax-ts: fix GPIO and IRQ in example

The driver is using level triggered interrupt (low) which is backed by
an active low GPIO that can be used to wake the controller by driving it
low. Let's annotate it properly in the example.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220920042608.1865560-2-dmitry.torokhov@gmail.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>