ath79: add support for the TP-LINK WBS510 V1

This adds support for a popular low-cost 5GHz N based AP

Specifications:
- SoC: Atheros AR9344
- RAM: 64MB
- Storage: 8 MB SPI NOR
- Wireless: 5GHz 300 Mbps, 2x RP-SMA connector, 27 dBm TX power
- Ethernet: 1x 10/100 Mbps with 24V POE IN, 1x 10/100 Mbps

Installation:
Flash factory image through stock firmware WEB UI
or through TFTP
To get to TFTP recovery just hold reset button while powering on for
around 4-5 seconds and release.
Rename factory image to recovery.bin
Stock TFTP server IP:192.168.0.100
Stock device TFTP adress:192.168.0.254

Signed-off-by: Andrew Cameron <apcameron@softhome.net>

target/linux/ath79/dts/ar9344_tplink_wbs510-v1.dts

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "ar9344_tplink_cpexxx-v1.dtsi"
+
+/ {
+	compatible = "tplink,wbs510-v1", "qca,ar9344";
+	model = "TP-Link WBS510 v1";
+};
+
+&led_link4 {
+	gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
+};