ipq807x: add Edgecore EAP102

ipq807x: add Edgecore EAP102

The Edgecore EAP102 is a wall/ceiling mountable AP. The AP can be
powered by either PoE or AC adapter.

Device info:
 - IPQ8071-A SoC
 - 1GiB RAM
 - 256MiB NAND flash
 - 32MiB SPI NOR
 - 2 Ethernet ports
 - 1 Console port
 - 2GHz/5GHz AX WLAN
 - 2 USB 2.0 ports

Install instructions:

Prerequistes - TFTP server, preferrably within 192.168.1.0/24
	       Console cable plugged in (115200 8N1 no flow control)

1. Power on device and interrupt u-boot to obtain u-boot CLI

2. set serverip to IP address of the TFTP server:

	`setenv serverip 192.168.1.250`

3. Download image from TFTP server:

	`tftpboot 0x44000000 openwrt-ipq807x-generic-edgecore_eap102-squashfs-nand-factory.ubi`

4. Flash ubi image to both partitions and reset:

	`sf probe
	 imxtract 0x44000000 ubi
	 nand device 0
	 nand erase 0x0 0x3400000
	 nand erase 0x3c00000 0x3400000
	 nand write $fileaddr 0x0 $filesize
	 nand write $fileaddr 0x3c00000 $filesize
	 reset`

Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>