ath79: wndap360: use default 9600 baud rate

It seems the bootloader does not use 115200, which the dtsi file
specifies. Remove it.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: openwrt/openwrt#22735
Signed-off-by: Robert Marko <robimarko@gmail.com>
(cherry picked from commit 8d1b259)

Author: neheb

target/linux/ath79/dts/ar7161_netgear_wndap360.dts

@@ -10,6 +10,10 @@
 	compatible = "netgear,wndap360", "qca,ar7161";
 	model = "Netgear WNDAP360";
 
+	chosen {
+		/delete-property/ bootargs;
+	};
+
 	aliases {
 		led-boot = &led_power_orange;
 		led-failsafe = &led_power_orange;