[ARM] MX35 devices support

The i.MX35 basically features the same peripherals as the i.MX31 with
some differences:

- The i.MX35 has a FEC ethernet controller
- The NAND controller base addresses are different
- The i.MX35 has only 3 UARTs

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>