ath79: add support for ASUS RP-AC66

Asus RP-AC66 Repeater

Hardware specifications:
Board: AP152
SoC: QCA9563
DRAM: 64MB DDR2
Flash: 25l128 16MB SPI-NOR
LAN/WAN: 1x1000M QCA8033
WiFi 5GHz: QCA9880
Clocks: CPU:775.000MHz, DDR:650.000MHz, AHB:258.333MHz, Ref:25.000MHz

MAC addresses as verified by OEM firmware:
use            address   source
Lan/Wan   *:24         art 0x1002 (label)
2G             *:24         art 0x1002
5G             *:26         art 0x5006

Installation:

Asus windows recovery tool:
 - install the Asus firmware restoration utility
 - unplug the router, hold the reset button while powering it on
 - release when the power LED flashes slowly
 - specify a static IP on your computer:
     IP address: 192.168.1.75
     Subnet mask 255.255.255.0
 - Start the Asus firmware restoration utility, specify the factory image
    and press upload
 - Do not power off the device after OpenWrt has booted until the LED flashing.

TFTP Recovery method:
 - set computer to a static ip, 192.168.1.75
 - connect computer to the LAN 1 port of the router
 - hold the reset button while powering on the router for a few seconds
 - send firmware image using a tftp client; i.e from linux:
 $ tftp
 tftp> binary
 tftp> connect 192.168.1.1
 tftp> put factory.bin
 tftp> quit

Signed-off-by: Tamas Balogh <tamasbalogh@hotmail.com>

target/linux/ath79/generic/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom

@@ -12,6 +12,9 @@ case "$FIRMWARE" in
 	8dev,lima)
 		caldata_extract "art" 0x1000 0x800
 		;;
+	asus,rp-ac66)
+		caldata_extract "art" 0x1000 0x440
+		;;
 	avm,fritz1750e|\
 	avm,fritz4020|\
 	avm,fritz450e|\

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

@@ -21,6 +21,7 @@ case "$FIRMWARE" in
 	avm,fritzdvbc)
 		caldata_extract "urlader" 0x198a 0x844
 		;;
+	asus,rp-ac66|\
 	comfast,cf-wr650ac-v1|\
 	comfast,cf-wr650ac-v2|\
 	devolo,dlan-pro-1200plus-ac|\