usb: dwc3: gadget: implement Global Command support

This will be used by the ep0 layer for implementing
Set SEL Standard Request.

Change-Id: I7c5e2d4a4c9a92295e6895585d71939fb1a6f75f
Signed-off-by: Felipe Balbi <balbi@ti.com>
[pkondeti@codeaurora.org: resolved merge conflict]
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
3 files changed