qualcommax: ipq807x: add support for Netgear WAX630

qualcommax: ipq807x: add support for Netgear WAX630

```
Specifications:
* CPU: Qualcomm IPQ8074A, SoC Version: 2.0, Quad core 1651 MHz
* RAM: 1 GiB of DDR3 466 MHz
* Flash: NAND 512 MiB (Winbond W29N04GZ)
* 6 RGB LEDs: Power, LAN1, LAN2, 2.4GHz, 5GHz H and 5GHz L
* UART: One 4-pin populated header next to the heatsink and a chip.
  GND RXD TXD, beginning from the external antennas. 115200n8.

Lan:
* One 100/1000/2.5GBASE-T Gigabit Ethernet 802.3bt/at
* One 100/1000 Gigabit Ethernet

Wlan:
* 4x4 in 2.4GHz  : 802.11b/g/n/ax
* 4x4 in 5.0GHz L: 802.11a/n/ac/ax
* 4x4 in 5.0GHz H: 802.11a/n/ac/ax
* OFDM and OFDMA
* Bidir and MU-MIMO
* Internal antenna 2.86/4.41/4.98 dBi (2.4GHz/5GHz L/5GHz H)

Power:
* 802.3bt/at 30.1W
* DC 12V/3.5A

Mounting: Wall and ceiling
```

```
1.  Download the OpenWrt initramfs image. Copy the image to a TFTP server
2.  Connect to the console on the AP, and connect the LAN port to your LAN
3.  Stop auto boot to get to U-boot shell, interrupt the autoboot process by pressing '0' when prompted
4.  Set active_fw in env
4.  Set active_fw in env
    # setenv active_fw 1
5.  Transfer the initramfs image with TFTP
    # setenv serverip 192.168.1.10 (IP of TFTP server host)
    # setenv ipaddr 192.168.1.1 (IP used by the router for getting the image, must be in the same subnet as the TFTP host)
    # tftpboot openwrt-qualcommax-ipq807x-netgear_wax630-initramfs-uImage.itb
6.  Reboot and load the image
    # bootm
7.  SCP factory image to the AP
    # scp openwrt-qualcommax-ipq807x-netgear_wax630-squashfs-factory.ubi root@192.168.1.1:/tmp/
8.  Connect to device using SSH (use the LAN port)
9.  Flash squashfs-factory.ubi from within the initramfs instance of OpenWRT
    Before you flash, please check your mtd partitions where mtdX is the right mtd rootfs partition.
    # cat /proc/mtd (To check MTD partitions)
    # ubiformat /dev/mtd18 -y -f /tmp/openwrt-qualcommax-ipq807x-netgear_wax630-squashfs-factory.ubi
10. Set active_fw to 0
    # /usr/sbin/fw_setenv active_fw 0
11. Reboot the AP and your done
    # reboot
```

Reviewed-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Kristian Skramstad <kristian+github@83.no>