The usb phys need to be controlled dynamically on some Rockchip SoCs.
So set the new HCD flag which prevents USB core from trying to manage
our phys.
Change-Id: I2d1197f42fe49bc4e454954481f344256fddb557
Signed-off-by: Bin Yang <yangbin@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>