ipq807x: add initial support for prpl Foundation Haze board

ipq807x: add initial support for prpl Foundation Haze board

Haze is prpl Foundation's reference board (WNC LVRP).

Board info:

 - IPQ8072A SoC
 - 2 GiB RAM
 - 4 GiB eMMC
 - 8MiB SPI NOR (MX25U6435F)

 - 3x 1GigE ports (QCA8075)
 - 1x 10GigE port (AQR113C)
 - 1x SFP cage

 - WiFi 6GHz 160MHz (QCN9074)
 - WiFi 5GHz 80+80MHz (QCN5054)
 - WiFi 2.4G (QCN5024)

 - ARM Standard 20-pin 2.54mm/0.1" JTAG (1V8 !!!)
 - Bluetooth v5.0 + EDR with integrated Class 1 PA (CYW20704)
 - 1x M.2 B-key socket with PCIe 3.0
 - 1x USB 3.0 port
 - UART 4-pin 3V3(arrow),RX,TX,GND (115200 8N1)
 - Reset and WPS buttons

Flashing instructions:

 1. From U-Boot boot OpenWrt using initramfs image:

    IPQ807x# tftpboot openwrt-ipq807x-generic-prpl_haze-initramfs-uImage.itb && bootm

 2. In OpenWrt running from initramfs execute sysupgrade:

    root@OpenWrt:/# sysupgrade -n /tmp/openwrt-ipq807x-generic-prpl_haze-squashfs-sysupgrade.bin

Work in progress/known issues:

 * SFP feature not implemented/tested
 * M.2 feature not implemented/tested
 * Bluetooth feature not implemented/tested
 * 6GHz wireless should be working, but not tested
 * MAC address assigments for LAN interfaces

Signed-off-by: Petr Štetiar <ynezz@true.cz>