msm: Add device tree support for HSUSB

Add device tree support for MSM HSUSB.  The OTG driver registers
gadget and host platform devices based on the operational mode.
This patch also updates the copper device tree source file with
HSUSB device specifics.

Change-Id: I0a50b0500d15f32ff65468cdb411398a80a20329
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>