arm64: dts: qcom: sc7180: Configure USB as wakeup source

The dwc3 USB controller of the sc7180 supports USB remote
wakeup, configure it as a wakeup source.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220901102946.v2.1.I347ea409ee3134bd32a29e33fecd1a6ef32085a0@changeid