ARM: dts: rockchip: enable usb for rv1108-evb

Rockchip's rv1108-evb board has one usb otg controller and one usb
host controller, each usb controller connect with one usb-phy port
through UTMI+ interface. This patch enables them to support usb on
rv1108-evb board.

Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>