usb/uhci: Move PCI-related code into a separate file

Some machines (like Aspeed ARM) only have a sysbus UHCI controller.
The current UHCI implementation only supports PCI based UHCI controllers.
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usb/uhci: Move PCI-related code into a separate file

Some machines (like Aspeed ARM) only have a sysbus UHCI controller.
The current UHCI implementation only supports PCI based UHCI controllers.
Move the UHCI-PCI device code into a separate file so that it is possible
to create a sysbus UHCI device without PCI dependency.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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