ath79: add support for gl-e750

The gl-e750 is a portable travel router that gives you safe access to
the internet while traveling.

Specifications:
- SoC: Qualcomm Atheros AR9531 (650MHz)
- RAM: 128 MB DDR2
- Flash: 16 MB SPI NOR (W25Q128FVSG) + 128 MB SPI NAND (GD5F1GQ4UFYIG)
- Ethernet: 10/100: 1xLAN
- Wireless: QCA9531 2.4GHz (bgn) + QCA9887 5GHz (ac)
- USB: 1x USB 2.0 port
- Switch: 1x switch
- Button: 1x reset button
- OLED Screen: 128*64 px

MAC addresses based on vendor firmware:
LAN *:a0 art 0x0
2.4GHz *:a1 art 0x1002
5GHz *:a2 art calculated from art 0x0 + 2

Flash firmware:
Since openwrt's kernel already exceeds 2MB, upgrading from the official
version of GL-inet (v3.100) using the sysupgrade command will break the
kernel image. Users who are using version 3.100 can only upgrade via
uboot. The official guidance for GL-inet is as follows:
https://docs.gl-inet.com/en/3/troubleshooting/debrick/

In the future, GL-inet will modify the firmware to support the sysupgrade
command, so users will be able to upgrade directly with the sysupgrade
command in future releases.

OLED screen control:
OLED controller is connected to QCA9531 through serial port, and can send
instructions to OLED controller directly through serial port.
Refer to the links below for a list of supported instructions:
https://github.com/gl-inet/GL-E750-MCU-instruction

Signed-off-by: Luochongjun <luochongjun@gl-inet.com>
[fix alphabetic sorting in 10-fix-wifi-mac, drop check-kernel-size]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ath79/nand/base-files/etc/board.d/02_network

@@ -8,7 +8,8 @@ ath79_setup_interfaces()
 	local board="$1"
 
 	case "$board" in
-	aerohive,hiveap-121)
+	aerohive,hiveap-121|\
+	glinet,gl-e750)
 		ucidef_set_interface_lan "eth0"
 		;;
 	domywifi,dw33d)

target/linux/ath79/nand/base-files/etc/hotplug.d/ieee80211/10-fix-wifi-mac

@@ -10,6 +10,11 @@ PHYNBR=${DEVPATH##*/phy}
 board=$(board_name)
 
 case $board in
+	glinet,gl-e750)
+		# Set mac address for 5g device
+		[ "$PHYNBR" -eq 0 ] && \
+			macaddr_add $(mtd_get_mac_binary art 0x0) 2 > /sys${DEVPATH}/macaddress
+		;;
 	zyxel,nbg6716)
 		# Set mac address for 2.4g device
 		[ "$PHYNBR" -eq 1 ] && \