UPSTREAM: usb: dwc3: pci: add dr-mode for Intel dwc3

UPSTREAM: usb: dwc3: pci: add dr-mode for Intel dwc3

It's know that Intel's SoCs' dwc3 integration is
peripheral-only since Intel implements its own
portmux for role-swapping. In order to prevent dwc3
from ever registering and XHCI platform_device,
let's just set dr-mode to peripheral-only on Intel
SoCs.

Change-Id: Ic7a57ae89a4ea2a2f04a1aff581d728add15a034
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>
(cherry picked from commit e6fe66fe08cdf9c5d0eb6a6e209621f74f7ee60b)