Add omap-usb3 and omap-usb2 data node in OMAP5 device tree file.

The information for the node added here is available @
Documentation/devicetree/bindings/usb/usb-phy.txt
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Benoit Cousson <benoit.cousson@linaro.org>