scons,python: revert Always generate default create() methods.

This reverts commit 7bb690c1ee70b1c82b23eeb68dcda3dc6e5c97f7.

Change-Id: If1b44162b24409fb44daec0159852fa44937184d
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/46879
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
2 files changed