pylibfdt: correct license information

Setuptools 78.1.1 shows warnings:

* Pattern 'GPL' did not match any files.
* Pattern 'BSD-2-Clause' did not match any files.
* SetuptoolsDeprecationWarning: License classifiers are deprecated.

Cf. https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Bryan Brattlof <bb@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
1 file changed