boards: nxp: frdm_kw41z: Fix unit and first address mismatch

This fixes the following warnings:

> devicetree error: unit address and first address in 'reg' (0x70000)
> don't match for
> /soc/flash-controller@40020000/flash@0/partitions/partition@700000

Signed-off-by: Reto Schneider <[email protected]>

Author: rettichschnidi

boards/nxp/frdm_kw41z/frdm_kw41z.dts

@@ -184,7 +184,7 @@
 			label = "image-0";
 			reg = <0x00000000 0x00070000>;
 		};
-		storage_partition: partition@700000 {
+		storage_partition: partition@70000 {
 			label = "storage";
 			reg = <0x00070000 0x00010000>;
 		};