ath79: add support for MikroTik RouterBOARD 921GS-5HPacD-15s

The MikroTik RouterBOARD 921GS-5HPacD-15s (mANTBox 15s) is an outdoor
antenna for 5 GHz with an built-in router. This ports the board from
ar71xx.

See https://mikrotik.com/product/RB921GS-5HPacD-15S for more info.

Specifications:
 - SoC: Qualcomm Atheros QCA9558 (720 MHz)
 - RAM: 128 MB
 - Storage: 128 MB NAND
 - Wireless: external QCA9892 802.11a/ac 2x2:2
 - Ethernet: 1x 1000/100/10 Mbps, integrated, via AR8031 PHY, passive PoE in
 - SFP: 1x host

Working:
 - NAND storage detection
 - Ethernet
 - Wireless
 - 1x user LED (blinks during boot, sysupgrade)
 - Reset button
 - Sysupgrade

Untested:
 - SFP cage (probably not working)

Installation (untested):
 - Boot initramfs image via TFTP and then flash sysupgrade image

As the embedded RB921-pcb is a stripped down version of the RB922 this patch
adds a common dtsi for this series and includes this to the final dts-files.

Signed-off-by: Sven Roederer <devel-sven@geroedel.de>
[move ath10k-leds closer to ath10k definition in DTS files]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

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

@@ -15,6 +15,7 @@ ath79_setup_interfaces()
 		ucidef_add_switch "switch1" \
 			"0@eth1" "1:lan:4" "2:lan:1" "3:lan:2" "4:lan:3"
 		;;
+	mikrotik,routerboard-921gs-5hpacd-15s|\
 	mikrotik,routerboard-922uags-5hpacd|\
 	mikrotik,routerboard-lhg-2nd|\
 	mikrotik,routerboard-wap-g-5hact2hnd)
@@ -35,6 +36,7 @@ ath79_setup_macs()
 	local mac_base="$(cat /sys/firmware/mikrotik/hard_config/mac_base)"
 
 	case "$board" in
+	mikrotik,routerboard-921gs-5hpacd-15s|\
 	mikrotik,routerboard-lhg-2nd|\
 	mikrotik,routerboard-wap-g-5hact2hnd)
 		label_mac="$mac_base"

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

@@ -11,6 +11,7 @@ board=$(board_name)
 case "$FIRMWARE" in
 "ath10k/cal-pci-0000:00:00.0.bin")
 	case $board in
+	mikrotik,routerboard-921gs-5hpacd-15s|\
 	mikrotik,routerboard-wap-g-5hact2hnd)
 		caldata_sysfsload_from_file $wlan_data 0x5000 0x844
 		;;

target/linux/ath79/mikrotik/base-files/lib/upgrade/platform.sh

@@ -32,6 +32,7 @@ platform_do_upgrade() {
 
 	case "$board" in
 	mikrotik,routerboard-493g|\
+	mikrotik,routerboard-921gs-5hpacd-15s|\
 	mikrotik,routerboard-922uags-5hpacd)
 		platform_do_upgrade_mikrotik_nand "$1"
 		;;