tree-wide: s/revert_creds_light()/revert_creds()/g

tree-wide: s/revert_creds_light()/revert_creds()/g

Rename all calls to revert_creds_light() back to revert_creds().

Link: https://lore.kernel.org/r/20241125-work-cred-v2-6-68b9d38bb5b2@kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>