ath79: add support for ON Networks N150R

This is a rebranded Netgear WNR612v2, specs are the same.

 - Atheros AR7240 (Python) @400MHz
 - flash 4MB
 - ram 32MB
 - ethernet 10/100: 1xwan + 2xlan (only two)
 - radio AR9285

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>

target/linux/ath79/dts/ar7240_on_n150r.dts

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "ar7240_netgear_wnr612-v2.dtsi"
+
+/ {
+	model = "ON Network N150R";
+	compatible = "on,n150r";
+};
+