pylibfdt: Fix version normalization warning

Fix the following version normalization warning:
"
/usr/lib/python3/dist-packages/setuptools/dist.py:530: UserWarning: Normalizing '2023.01' to '2023.1'
"

Using suggestion from Richard Jones:
https://github.com/pypa/setuptools/issues/308#issuecomment-405817468



Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>