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>
diff --git a/tools/dtoc/setup.py b/tools/dtoc/setup.py
index 5e092fe..ae9ad04 100644
--- a/tools/dtoc/setup.py
+++ b/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+',