Rename the variable holding the usb otg platform data to avoid clash
with usb host platform data variable.

usb_pdata -> usb_otg_pdata
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>