ARM: dts: vf610-zii-dev-rev-c: fix polarity of at86rf233 reset line

at86rf230 driver starts with having reset line high, and then drives it
low and then high again, and even calls it "rstn" internally, therefore
it needs to be annotated as "active low" in the DTS.

This will make difference when at86rf230 driver will be converted to
gpiod API that respects declared line polarity.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/vf610-zii-dev-rev-c.dts

@@ -259,7 +259,7 @@ atzb-rf-233@1 {
 		xtal-trim = /bits/ 8 <0x06>;
 
 		sleep-gpio = <&gpio0 24 GPIO_ACTIVE_HIGH>;
-		reset-gpio = <&gpio6 10 GPIO_ACTIVE_HIGH>;
+		reset-gpio = <&gpio6 10 GPIO_ACTIVE_LOW>;
 
 		fsl,spi-cs-sck-delay = <180>;
 		fsl,spi-sck-cs-delay = <250>;