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>

scripts/dtc/pylibfdt/setup.py

@@ -158,12 +158,10 @@ setup(
     long_description_content_type="text/plain",
     url="https://git.kernel.org/pub/scm/utils/dtc/dtc.git",
     license="BSD",
-    license_files=["GPL", "BSD-2-Clause"],
+    license_files=["Licenses/gpl-2.0.txt", "Licenses/bsd-2-clause.txt"],
 
     classifiers=[
         "Programming Language :: Python :: 3",
-        "License :: OSI Approved :: BSD License",
-        "License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)",
         "Operating System :: OS Independent",
     ],