boards: arm: da1469x: Select code partition in device tree

This configures code partition in device tree.

Co-authored-by: Andrzej Kaczmarek <andrzej.kaczmarek@codecoup.pl>
Signed-off-by: Andrzej Kaczmarek <andrzej.kaczmarek@codecoup.pl>
Signed-off-by: Niek Ilmer <niek.ilmer.aj@renesas.com>
diff --git a/boards/arm/da1469x_dk_pro/da1469x_dk_pro.dts b/boards/arm/da1469x_dk_pro/da1469x_dk_pro.dts
index f881e4d..a15ded0 100644
--- a/boards/arm/da1469x_dk_pro/da1469x_dk_pro.dts
+++ b/boards/arm/da1469x_dk_pro/da1469x_dk_pro.dts
@@ -18,6 +18,7 @@
 		zephyr,flash = &flash0;
 		zephyr,console = &uart;
 		zephyr,shell-uart = &uart;
+		zephyr,code-partition = &slot0_partition;
 	};
 
 	leds {