soc: esp32s2: nvs: add NVS support using fixed partitions

add NVS support to esp32s2 using fixed partitions defined on DT

Signed-off-by: Glauber Maroto Ferreira <[email protected]>

Author: Glauber Maroto Ferreira

boards/xtensa/esp32s2_saola/esp32s2_saola.dts

@@ -76,3 +76,17 @@
 	sclk-pin = <36>;
 	csel-pin = <34>;
 };
+
+&flash0 {
+	status = "okay";
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		storage_partition: partition@9000 {
+			label = "storage";
+			reg = <0x00009000 0x00006000>;
+		};
+	};
+};