tests: drivers: flash: Add MAX32690 boards overlay file

Enable flash driver test for MAX32690 boards.

Signed-off-by: Mert Vatansever <mert.vatansever@analog.com>
Signed-off-by: Sadik Ozer <sadik.ozer@analog.com>

tests/drivers/flash/common/boards/max32690evkit_max32690_m4.overlay

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2024 Analog Devices, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		code_partition: partition@0 {
+			reg = <0x0 DT_SIZE_M(2)>;
+			read-only;
+		};
+
+		storage_partition: partition@200000 {
+			label = "storage";
+			reg = <0x200000 DT_SIZE_K(1)>;
+		};
+	};
+};

tests/drivers/flash/common/boards/max32690fthr_max32690_m4.overlay

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2024 Analog Devices, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		code_partition: partition@0 {
+			reg = <0x0 DT_SIZE_M(2)>;
+			read-only;
+		};
+
+		storage_partition: partition@200000 {
+			label = "storage";
+			reg = <0x200000 DT_SIZE_K(1)>;
+		};
+	};
+};