kirkwood: add support for Ctera C200 V1 NAS

2-Bay NAS - maximum two 3.5" Harddisks

Hardware:
  - SoC: Marvell 88F6281-A1 ARMv5TE Processor 1.2GHz
  - Ram: 512MB (4x Nanya NT5TU128M8GE-AC)
  - NAND Flash: 256MB (Samsung 216 K9F2G08U0C)
  - Lan: 1x GBE (Marvell 88E1116R-NNC1)
  - Storage: 2x SATA HDD 3.5" Slot
  - USB: 2x USB 2.0 port
  - Console: Internal J3 connector (1: Vcc, 2: Rx, 3: Tx, 4: GND)
  - LEDs: 13x GPIO controlled
  - Buttons: 2x GPIO controlled

Known issues:
  - Buzzer is unused due lack of proper driver

Installation:
  - Apply factory initramfs image via stock web-gui.
  - Do sysupgrade to make installation complete.

Back to stock:
  - OpenWrt rootfs partition use unused space after stock firmware.
  - Full revert is possible.
  - Login via ssh and run: ctera_c200-v1_back_to_factory

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Reviewed-by: Sungbo Eo <mans0n@gorani.run>
[apply sorting to device recipe]
Signed-off-by: Sungbo Eo <mans0n@gorani.run>

target/linux/kirkwood/base-files/sbin/ctera_c200-v1_back_to_factory

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+. /lib/functions.sh
+
+case $(board_name) in
+ctera,c200-v1)
+	part=$(find_mtd_part "active_bank")
+
+	if [ -n "$part" ]; then
+		active_bank="$(strings $part | grep bank)"
+
+		if [ $active_bank = "bank1" ]; then
+			echo "bank2" > /tmp/change_bank
+		else
+			echo "bank1" > /tmp/change_bank
+		fi
+
+		mtd write /tmp/change_bank active_bank
+		reboot
+	else
+		echo "active_bank partition missed!"
+		return 1
+	fi
+	;;
+*)
+	echo "Unsupported hardware."
+	;;
+esac