[nrf fromlist] tests: dfu: img_util: Fix partition detection

Fixes the logic in detecting which partition is being executed from

Upstream PR #: 106189

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

Author: nordicjm

tests/subsys/dfu/img_util/src/main.c

@@ -13,11 +13,9 @@
 #define SLOT0_PARTITION		slot0_partition
 #define SLOT1_PARTITION		slot1_partition
 
-#define PARTITION_IS_RUNNING_APP_PARTITION(label)                                            \
-	DT_SAME_NODE(PARTITION_NODE_MTD(DT_CHOSEN(zephyr_code_partition)),                   \
-		PARTITION_MTD(label)) &&                                                     \
-	(PARTITION_OFFSET(label) <= CONFIG_FLASH_LOAD_OFFSET &&                              \
-	 PARTITION_OFFSET(label) + PARTITION_SIZE(label) > CONFIG_FLASH_LOAD_OFFSET)
+#define PARTITION_IS_RUNNING_APP_PARTITION(label)				\
+	DT_SAME_NODE(DT_MEM_FROM_PARTITION(DT_CHOSEN(zephyr_code_partition)),	\
+		     DT_MEM_FROM_PARTITION(DT_NODELABEL(label)))
 
 #if PARTITION_IS_RUNNING_APP_PARTITION(slot0_partition)
 #define UPLOAD_PARTITION_ID	PARTITION_ID(SLOT1_PARTITION)