ARM: dts: OMAP5: add dwc3 omap and dwc3 core data

Add dwc3 omap glue data to the omap5 dt data file.
The information about the dt node added here is available @
Documentation/devicetree/bindings/usb/omap-usb.txt.

Also added dwc3 core dt data as a subnode to dwc3 omap glue
data in omap5 dt data file.
The information for the entered data node is available @
Documentation/devicetree/bindings/usb/dwc3.txt

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Benoit Cousson <benoit.cousson@linaro.org>