dtoc: Switch to setuptools

With the distutils module having been removed with Python 3.12, switch
to using setuptools instead.

Signed-off-by: Tom Rini <trini@konsulko.com>

tools/dtoc/setup.py

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0+
 
-from distutils.core import setup
+from setuptools import setup
 setup(name='dtoc',
       version='1.0',
       license='GPL-2.0+',