Add sample overlays for Pico/w boards

Signed-off-by: Andreas Wolf <awolf002@gmail.com>

Author: Snap-A

samples/subsys/fs/littlefs/boards/rpi_pico.overlay

@@ -0,0 +1,21 @@
+
+/delete-node/ &code_partition;
+
+&flash0 {
+    partitions {
+        compatible = "fixed-partitions";
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        code_partition: partition@100 {
+            label = "code-partition";
+            reg = <0x100 (DT_SIZE_M(2)-0x100-DT_SIZE_K(64))>;
+            read-only;
+        };
+
+        storage_partition: storage_partition@1f0000 {
+            label = "storage-partition";
+            reg = <(DT_SIZE_M(2)-DT_SIZE_K(64)) (DT_SIZE_K(64))>;
+        };
+    };
+};

samples/subsys/fs/littlefs/boards/rpi_pico_rp2040_w.overlay

@@ -0,0 +1 @@
+#include "rpi_pico.overlay"