usb: dwc2: gadget: Add IOT device IDs, configure core accordingly

Add new device IDs for IOT gadget. Done changes in probe to
configure core accordingly depending on device ID value.

Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>