scripts: Update to use exec_module() instead of load_module()

This is deprecated in python 3.12 and Fedora 35 is throwing warnings so
move to the new functions.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 655cd3f6)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>