usb: dwc3: gadget: modify the scale in vbus_draw callback

usb: dwc3: gadget: modify the scale in vbus_draw callback

Currently, vbus_draw callback used wrong scale for power_supply.
The unit of power supply should be uA.
Therefore, this patch will fix this problem.

Fixes: 99288de36020 ("usb: dwc3: add an alternate path in vbus_draw callback")
Reported-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Ray Chi <raychi@google.com>
Link: https://lore.kernel.org/r/20210327182809.1814480-2-raychi@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>