arm, davinci: add cam_enc_4xx support

- DM368 SOC
- booting with spl not with UBL from TI
- before loading u-boot from NAND into RAM, test
  the RAM with the post memory test. If error
  is found, switch all LEDs on and halt system.
- SPI Flash
  Dataflash Typ: M25PE80
- Ethernet DM9161BI
- MMC
- USB

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Sandeep Paulraj <s-paulraj@ti.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>