ipq806x: Add support for Xiaomi Mi Router HD (R3D)
Xiaomi R3D is a 2.4/5 GHz band 11ac router, based on IPQ8064.
Specification:
* SoC: Qualcomm IPQ8064
* RAM: 512MB DDR3
* Flash: 256MB NAND (Macronix MX30UF2G18AC-TI)
* Ethernet: 4x 10/100/1000 Mbps (1x WAN, 3x LAN)
* WiFi: Qualcomm QCA9984 (5GHz, 4T4R, n/ac)
* WiFi: Qualcomm QCA9980 (2.4GHz, 4T4R, b/g/n)
* USB: 1x 3.0
* SATA: 1x SATA 3.1 (only for internal HDD 3.5")
* BTN: Power, Reset
* LEDS: Status(Green/Blue/Red)
* UART: present as 4-pads on the PCB (3.3V, 115200-8-N-1)
MAC addresses as verified by stock firmware:
| Interface | MAC | ART | Format |
|-------------+-------------------+---------+--------|
| WAN (label) | xx:xx:xx:xx:xx:B2 | 0x0 | binary |
| LAN | xx:xx:xx:xx:xx:B3 | 0x6 | binary |
| WiFi 2g | xx:xx:xx:xx:xx:B4 | 0x1006 | binary |
| WiFi 5g | xx:xx:xx:xx:xx:B5 | 0x5006 | binary |
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