lantiq: fritz7362sl: fix SPI flash node reg property

The &spi node has #address-cells = <1> and #size-cells = <0>. Drop the
extra 0 in the reg property from the SPI flash node to ensure it's
number of cells matches the definition in the parent node. This also
makes the reg property for the SPI flash node consistent with all other
VR9 boards.

Fixes: eae6cac ("lantiq: add support for AVM FRITZ!Box 7362 SL")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

target/linux/lantiq/files/arch/mips/boot/dts/lantiq/vr9_avm_fritz7362sl.dts

@@ -22,7 +22,7 @@
 		#address-cells = <1>;
 		#size-cells = <1>;
 		compatible = "jedec,spi-nor";
-		reg = <4 0>;
+		reg = <4>;
 		spi-max-frequency = <1000000>;
 
 		urlader: partition@0 {