[RR] Do not add signoff when cherry picking commits

During "rebase", the ciq commits are cherry picked one by one from the
branch that contains the previous version of kernel.
Since they are already signed off, there's no need to add another signoff.
Moreover, this ends up appending signoffs every time a new rolling release
update is done, polutting the commit message.

Signed-off-by: Roxana Nicolescu <[email protected]>

Author: roxanan1996

rolling-release-update.py

@@ -398,7 +398,7 @@ def check_for_fips_protected_changes(repo, branch, common_tag):
         commit_info = repo.git.show("--pretty=%h %s", "-s", ciq_commit)
         print(f"  [{commits_applied}/{len(rolling_commit_map)}] {commit_info}")
         result = subprocess.run(
-            ["git", "cherry-pick", "-s", ciq_commit], stderr=subprocess.PIPE, stdout=subprocess.PIPE, cwd=args.repo
+            ["git", "cherry-pick", ciq_commit], stderr=subprocess.PIPE, stdout=subprocess.PIPE, cwd=args.repo
         )
         if result.returncode != 0:
             print(f"[rolling release update] ERROR: Failed to cherry-pick commit {ciq_commit}")