ARM: vt8500: Add support for UHCI companion controller

Add support for a generic non-pci UHCI companion controller.
Existing board files for arch-vt8500 updated to include UHCI
support.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>