ARM: dts: rockchip: Add usb host for rk3288-vyasa

Add usb host support for rk3288-vyasa, board support hub power
through phy_pwr_en and usb2 host power through usb2_pwr_en and
naming conversion followed as per schematic.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>