dt-bindings: tcan4x5x: Make wake-gpio an optional gpio
The wake-up of the device can be configured as an optional feature of the device. Move the wake-up gpio from a requried property to an optional property. Signed-off-by: NDan Murphy <dmurphy@ti.com> Cc: Rob Herring <robh@kernel.org> Reviewed-by: NSean Nyekjaer <sean@geanix.com> Tested-by: NSean Nyekjaer <sean@geanix.com> Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
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