ath79: remove lines-initial-states property

The lines-initial-states property was an early attempt to set the latch
bit of the shift register on driver probe. It is not implemented in the
driver and was rejected upstream. The latch bit was always set by a GPIO
hog, so this property is safe to drop.

Signed-off-by: David Bauer <mail@david-bauer.net>

target/linux/ath79/dts/qca9558_netgear_ex7300.dtsi

@@ -33,7 +33,6 @@
 			gpio-controller;
 			#gpio-cells = <2>;
 			registers-number = <1>;
-			lines-initial-states = /bits/ 8 <0xff>;
 			spi-max-frequency = <500000>;
 
 			gpio_latch_bit {

target/linux/ath79/dts/qca9561_avm_fritz4020.dts

@@ -36,7 +36,6 @@
 			gpio-controller;
 			#gpio-cells = <2>;
 			registers-number = <1>;
-			lines-initial-states = /bits/ 8 <0xff>;
 			spi-max-frequency = <10000000>;
 
 			gpio_latch_bit {