PXA: Voipac PXA270 Support

This patch adds support for the Voipac PXA270 board. The support includes:
- Ethernet
- USB
- MMC
- NOR Booting
- OneNAND Booting
- LCD
- HDD

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Acked-by: Scott Wood <scottwood@freescale.com>