fsl_mx3_udc: Add i.MX35 support

The i.MX35 works fine with this driver, but we do not have
the usb_ahb clock.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>