tests: drivers: flash common testing in non SPI-NOR

Set an overlay to build tests/drivers/flash/common/
drivers.flash.common.disable_spi_nor when the SPI NOR exists
but test does not use it

Signed-off-by: Francois Ramu <francois.ramu@st.com>

Author: FRASTM

tests/drivers/flash/common/boards/fk7b0m1_vbt6.overlay

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2025 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/delete-node/ &storage_partition;
+
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* Set last blocks of the code flash as storage partition */
+		storage_partition: partition@1e0000 {
+			label = "storage";
+			reg = <0x1e000 DT_SIZE_K(8)>;
+		};
+	};
+};

tests/drivers/flash/common/boards/mini_stm32h7b0.overlay

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2025 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/delete-node/ &storage_partition;
+
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* Set 2 last blocks of the code flash as storage partition */
+		storage_partition: partition@1e000 {
+			label = "storage";
+			reg = <0x1e000 DT_SIZE_K(8)>;
+		};
+	};
+};