misc: Revert gem5 versioning for develop branch

Change-Id: I80cbfc766c71a3137a427d38da4f46b80cd39856
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/60639
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed