uboot-imx

MLK-15026 usb: host: xhci-imx8: add imx8 USB3 driver

It is for imx8qm and imx8qxp, and the cadence IP is in it.

Both DM and Non-DM are supported in this driver. The DM support
only probes the USB3 node, but won't parse any properties from node in DTS.
The registers address are still hard coded, that share with non-DM codes.

The DM driver will enable the power of USB3 controller and USB3 PHY. But
for Non-DM driver, users need to power up them in board level codes.

Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 952d331f7b12ba278d4f6a68b0be2b1e6d1b31b8)