arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub

Add nodes for the onboard USB hub on trogdor devices. Remove the
'always-on' property from the hub regulator, since the regulator
is now managed by the onboard_usb_hub driver.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Link: https://lore.kernel.org/r/20210609150159.v12.5.Ie0d2c1214b767bb5551dd4cad38398bd40e4466f@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>