rockchip: rk3399-puma: implement usb_hub_reset_devices for puma-rk3399

For some versions of the RK3399-Q7 (at least revisions v1.1 and v1.2
are affected), we need to turn on the power for the port connected to
the on-module USB hub only when the device is probed for the first
time to ensure that the hub does not enter a low-power mode (that
U-Boot's USB stack can't deal with).

Note that this is needed for U-Boot only, as Linux eventually manages
to attach the hub even when it has entered into its low-power state
(when the hub wakes up the next time) after a few seconds.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com>

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