ath79: add support for MikroTik RouterBOARD wAP-2nD (wAP)

The MikroTik RouterBOARD wAP-2nd (sold as wAP) is a small
2.4 GHz 802.11b/g/n PoE-capable AP.

Specifications:
 - SoC: Qualcomm Atheros QCA9533
 - Flash: 16 MB (SPI)
 - RAM: 64 MB
 - Ethernet: 1x 10/100 Mbps (PoE in)
 - WiFi: AR9531 2T2R 2.4 GHz (SoC)
 - 3x green LEDs (1x lan, 1x wlan, 1x user)

 See https://mikrotik.com/product/RBwAP2nD for more info.

Flashing:
 TFTP boot initramfs image and then perform sysupgrade. Follow common
 MikroTik procedure as in https://openwrt.org/toh/mikrotik/common.

Note: following 781d4bfb39
 The network setup avoids using the integrated switch and connects the
 single Ethernet port directly. This way, link speed (10/100 Mbps) is
 properly reported by eth0.

Signed-off-by: David Musil <0x444d@protonmail.com>
(cherry picked from commit e20de22442)

target/linux/ath79/mikrotik/base-files/etc/board.d/01_leds

@@ -7,7 +7,8 @@ board=$(board_name)
 
 case "$board" in
 mikrotik,routerboard-lhg-2nd|\
-mikrotik,routerboard-mapl-2nd)
+mikrotik,routerboard-mapl-2nd|\
+mikrotik,routerboard-wap-2nd)
 	ucidef_set_led_netdev "lan" "lan" "green:lan" "eth0"
 	;;
 mikrotik,routerboard-lhg-5nd)

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

@@ -19,6 +19,7 @@ ath79_setup_interfaces()
 	mikrotik,routerboard-lhg-5nd|\
 	mikrotik,routerboard-mapl-2nd|\
 	mikrotik,routerboard-sxt-5nd-r2|\
+	mikrotik,routerboard-wap-2nd|\
 	mikrotik,routerboard-wap-g-5hact2hnd|\
 	mikrotik,routerboard-wapr-2nd)
 		ucidef_set_interface_lan "eth0"
@@ -43,6 +44,7 @@ ath79_setup_macs()
 	mikrotik,routerboard-lhg-5nd|\
 	mikrotik,routerboard-mapl-2nd|\
 	mikrotik,routerboard-sxt-5nd-r2|\
+	mikrotik,routerboard-wap-2nd|\
 	mikrotik,routerboard-wap-g-5hact2hnd|\
 	mikrotik,routerboard-wapr-2nd)
 		label_mac="$mac_base"

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

@@ -27,6 +27,7 @@ case "$FIRMWARE" in
 	mikrotik,routerboard-lhg-2nd|\
 	mikrotik,routerboard-lhg-5nd|\
 	mikrotik,routerboard-sxt-5nd-r2|\
+	mikrotik,routerboard-wap-2nd|\
 	mikrotik,routerboard-wapr-2nd)
 		caldata_mikrotik_ath9k 0x1000 0x440 $(macaddr_add "$mac_base" 1)
 		;;