testing: use the copyleft-next-0.3.1 SPDX tag

Two selftests drivers exist under the copyleft-next license.
These drivers were added prior to SPDX practice taking full swing
in the kernel. Now that we have an SPDX tag for copyleft-next-0.3.1
documented, embrace it and remove the boiler plate.

Cc: Goldwyn Rodrigues <[email protected]>
Cc: Kuno Woudt <[email protected]>
Cc: Richard Fontana <[email protected]>
Cc: [email protected]
Cc: Ciaran Farrell <[email protected]>
Cc: Christopher De Nicolo <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Thorsten Leemhuis <[email protected]>
Cc: Andrew Morton <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Signed-off-by: Luis Chamberlain <[email protected]>
Reviewed-by: Tim Bird <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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