boards: renesas: da14695: Fix unit and first address mismatch

This fixes the following warning:

> unit address and first address in 'reg' (0x82000) don't match for
> /soc/flash-controller@38000000/flash@16000000/partitions/partition@80000

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

Author: rettichschnidi

boards/renesas/da14695_dk_usb/da14695_dk_usb.dts

@@ -118,7 +118,7 @@
 			label = "image-0";
 			reg = <0x0000c000 0x00076000>;
 		};
-		slot1_partition: partition@80000 {
+		slot1_partition: partition@82000 {
 			label = "image-1";
 			reg = <0x00082000 0x00076000>;
 		};