Add Pico and Pico_w Board Overlay Files to littlefs Sample Application

[Snap-A]

Is your enhancement proposal related to a problem? Please describe.
The current sample for using littelfs does not support the Pico and Pico_w boards.
The sample source is found in sample/subsys/fs/littlefs

Describe the solution you'd like
Adding the overlay files for these platforms will make the sample work without further changes

Describe alternatives you've considered
None

Additional context
I have created the two files in my fork and the sample applications are working.
The plan is to use this issue ticket to create a PR to update the sample code.

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[Snap-A]

Here are the proposed files for samples/subsys/fs/littlefs/boards/:

• rpi_pico.overlay

/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))>;
        };
    };
};

• rpi_pico_rp2040_w.overlay

#include "rpi_pico.overlay"

This created 'storage' partition will have 64 kB of space and that is sufficient to create the two test files used by the sample logic.

[JarmouniA]

@Snap-A You could just push a PR for this, you will get feedback there, no need to create an issue.

[Snap-A]

Thanks @JarmouniA . I will do that on Monday.

[Snap-A]

Created #87918

[Snap-A]

Closed, since its related PR #87918 was closed.