usbxhci: split usbxhci in portable and pci / soc specific drivers

For the reform kernel, we used to have a slightly modified
copy of port/usbxhci.c as the controller was implemented in
soc specific registers and requires some rocket science
initialization.

Instead, we want to have a common generic xhci driver (usbxhci)
and separate drivers that deal with the specific implementation
such as usbxhcipci and usbxhciimx.

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