initramfs_test: kunit tests for initramfs unpacking

Provide some basic initramfs unpack sanity tests covering:

- simple file / dir extraction
- filename field overrun, as reported and fixed separat

initramfs_test: kunit tests for initramfs unpacking

Provide some basic initramfs unpack sanity tests covering:

- simple file / dir extraction
- filename field overrun, as reported and fixed separately via
https://lore.kernel.org/r/[email protected]
- "070702" cpio data checksums
- hardlinks

Signed-off-by: David Disseldorp <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Brauner <[email protected]>

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