Add USB pinmux information and USB modes
for the USB controllers.

CC: Benoît Cousson <bcousson@baylibre.com>
Reviewed-by: NFelipe Balbi <balbi@ti.com>
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>