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>
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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>