ath79: add support for gl-ar750

This patch supports gl-ar750, which was previously supported by ar71xx.

Specification:
- SOC: QCA9531 (650MHz)
- Flash: 16 MiB (W25Q128FVSG)
- RAM: 128 MiB DDR2
- Ethernet: 10/100: 2xLAN + 10/100: 1xWAN
- Wireless: 2.4GHz (bgn) and 5GHz (ac)
- USB: 1x USB 2.0 port
- Switch: 1x switch
- Button: 1x reset button
- LED: 3x LEDS (white)

Flash instruction:
Support for sysupgrade directive upgrades, as well as luci upgrades.

Signed-off-by: Luochongjun <luochongjun@gl-inet.com>

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

@@ -156,6 +156,11 @@ ath79_setup_interfaces()
 	etactica,eg200)
 		ucidef_set_interface_lan "eth0" "dhcp"
 		;;
+	glinet,gl-ar750)
+		ucidef_set_interface_wan "eth1"
+		ucidef_add_switch "switch0" \
+			"0@eth0" "1:lan" "2:lan"
+		;;
 	glinet,gl-ar750s)
 		ucidef_add_switch "switch0" \
 			"0@eth0" "2:lan:2" "3:lan:1" "1:wan"

target/linux/ath79/base-files/etc/hotplug.d/firmware/11-ath10k-caldata

@@ -122,6 +122,7 @@ case "$FIRMWARE" in
 		ath10kcal_extract "art" 0x5000 0x844
 		ath10kcal_patch_mac $(macaddr_add $(cat /sys/class/net/eth0/address) +1)
 		;;
+	glinet,gl-ar750|\
 	glinet,gl-ar750s)
 		ath10kcal_extract "art" 0x5000 0x844
 		ath10kcal_patch_mac $(macaddr_add $(mtd_get_mac_binary art 0x0) +1)