boards: nxp: usb_kw24d512: Fix unit and first address mismatch

This fixes the following warning:

> 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/usb_kw24d512/usb_kw24d512.dts

@@ -106,7 +106,7 @@ zephyr_udc0: &usbd {
 			label = "image-0";
 			reg = <0x00000000 0x00070000>;
 		};
-		storage_partition: partition@700000 {
+		storage_partition: partition@70000 {
 			label = "storage";
 			reg = <0x00070000 0x00010000>;
 		};