ath79: fix dtc warnings in ruckus zf7372

|:69.4-14: Warning (reg_format): beamforming-2g-gpio@0:reg: property has invalid length (4 bytes)
|:85.4-14: Warning (reg_format): beamforming-5g-gpio@0:reg: property has invalid length (4 bytes)

Signed-off-by: Christian Lamparter <[email protected]>

target/linux/ath79/dts/ar9344_ruckus_zf7372.dts

@@ -63,6 +63,8 @@
 		mosi-gpios = <&gpio 15 GPIO_ACTIVE_HIGH>;
 		sck-gpios = <&gpio 14 GPIO_ACTIVE_HIGH>;
 		num-chipselects = <0>;
+		#address-cells = <1>;
+		#size-cells = <0>;
 
 		beamforming-2g-gpio@0 {
 			compatible = "fairchild,74hc595";
@@ -79,6 +81,8 @@
 		mosi-gpios = <&ath9k 15 GPIO_ACTIVE_HIGH>;
 		sck-gpios = <&ath9k 14 GPIO_ACTIVE_HIGH>;
 		num-chipselects = <0>;
+		#address-cells = <1>;
+		#size-cells = <0>;
 
 		beamforming-5g-gpio@0 {
 			compatible = "fairchild,74hc595";