dt-bindings: usb: tps6598x: Add wakeup property

Add wakeup property description. People can enable it with adding
the property.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230105075058.924680-1-jun.nie@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>