mach-cpuimx27: fix USB_ULPI build warnings

when CONFIG_USB_ULPI is not defined we actually get :
warning: 'otg_pdata' defined but not used
warning: 'usbh2_pdata' defined but not used

Signed-off-by: Eric Bénard <eric@eukrea.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: s.hauer@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>