ramips: samknows whitebox v8: set wifi frequency

Set the 2.4GHz frequency for WiFi.

Fixes: #15391
Signed-off-by: Mieczyslaw Nalewaj <[email protected]>

target/linux/ramips/dts/mt7621_samknows_whitebox-v8.dts

@@ -129,6 +129,7 @@
 		reg = <0x0000 0 0 0 0>;
 		nvmem-cells = <&eeprom_factory_0>;
 		nvmem-cell-names = "eeprom";
+		ieee80211-freq-limit = <2400000 2500000>;
 	};
 };