usb: dwc3: add a new glue layer for rockchip SoCs with INNO PHY

usb: dwc3: add a new glue layer for rockchip SoCs with INNO PHY

This patch add a rockchip specific glue layer to support
USB 3.0 HOST only mode for rockchip USB 3.0 core wrapper
consisting of USB 3.0 controller IP from Synopsys and USB
3.0 PHY IP from Innosilicon.

With this patch, we can support for XHCI integrated in
DWC3 IP on rockchip platforms. Because some INNO USB 3.0
PHY can't detect disconnection by PHY IP, and cause USB3
device unrecognized when replugged again. So we depend on
the HUB core driver to detect the disconnection, and send
notifier to DWC3 driver from USB PHY driver, then we can
do phy reset and remove/add hcd to reinit HCD.

Change-Id: I6972c6f9f8f7160dbd74ad531b843a65ccec5dc0
Signed-off-by: William Wu <wulf@rock-chips.com>