ARM: dts: kirkwood: Add Endian 4i Edge 200 board

Add Endian 4i Edge 200 is 5-port firewall.
It have also clone: Endian UTM Mini (The same hardware, with added WLAN
card).

Hardware:
  - SoC: Marvell 88F6281-A1 ARMv5TE Processor 1.2GHz
  - Ram: 512MB (4x Nanya NT5TU128M8GE-AC)
  - NAND Flash: 512MB (Micron 29F4G08AAC)
  - Lan 1-4: 4x GBE (Marvell 88E6171R-TFJ2)
  - Lan 5: 1x GBE (Marvell 88E1116R-NNC1)
  - Storage: MicroSD Slot
  - MCPIE: MiniPCIe Slot present [fitted with SparkLan WPEA-110N/E
          (Atheros AR9280 chipset) in Endian UTM Mini WLAN only]
  - USB: 1x USB 2.0 port
  - Console: RJ-45 port
  - LEDs: 3x GPIO controlled

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>