ipq40xx: add support for Pakedge WR-1

ipq40xx: add support for Pakedge WR-1

Pakedge WR-1 is a dual-band wireless router.

Specification
SoC: Qualcomm Atheros IPQ4018
RAM: 256 MB DDR3
Flash: 32 MB SPI NOR
WIFI: 2.4 GHz 2T2R integrated
      5 GHz 2T2R integrated
Ethernet: 5x 10/100/1000 Mbps QCA8075
USB: 1x 2.0
LEDS: 8x (3 GPIO controlled, 5 connected to switch)
Buttons: 1x GPIO controlled
UART: pin header J5
      1. 3.3V, 2. GND, 3. TX, 4. RX
      baud: 115200, parity: none, flow control: none

Installation
1. Rename initramfs image to:
   openwrt-ipq806x-qcom-ipq40xx-ap.dk01.1-c1-fit-uImage-initramfs.itb
   and copy it to USB flash drive with FAT32 file system.
2. Connect USB flash drive to the router and apply power while pressing
   reset button. Hold the button, on the lates bootloader version, when
   Power and WiFi-5 LEDs will start blinking release it. For the older
   bootloader holding it for 15 seconds should suffice.
3. Now the router boots the initramfs image, at some point (close to one
   minute) the Power LED will start blinking, when stops, router is fully
   booted.
4. Connect to one of LAN ports and use SSH to open the shell at
   192.168.1.1.
5. ATTENTION! now backup the mtd8 and mtd9 partitions, it's necessary if,
   at some point, You want to go back to original firmware. The firmware
   provided by manufacturer on its site is encrypted and U-Boot accepts
   only decrypted factory images, so there's no way to restore original
   firmware.
6. If the backup is prepared, transfer the sysupgrade image to the router
   and use 'sysupgrade' command to flash it.
7. After successful flashing router will reboot. At some point the Power
   LED will start blinking, wait till it stops, then router is ready for
   configuration.

Additional information
U-Boot command line is password protected. Password is unknown.

Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com>