usb: chipidea: make pci platform datas static

PCI chipideas' platform datas are not static as all such things should
be. Fix it.

Reported-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>