ARM: add support for d2 Network v2

ARM: add support for d2 Network v2

This patch adds support for the LaCie board d2 Network v2 which share
a lot of hardware caracteristics with the 2Big Network v2.

- CPU: Marvell 88F6281 1200Mhz
- SDRAM memory: 256MB DDR2 400Mhz
- 2 SATA ports: internal and eSATA
- Gigabit ethernet: PHY Marvell 88E1116R
- Flash memory: SPI NOR 512KB (Macronix MX25L4005A)
- i2c EEPROM: 512 bytes (24C04 type)
- 2 USB2 ports: host and host/device
- 1 push button
- 1 power switch
- 1 SATA LED (bi-color, blue and red)

Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>