cgroup: Readd some plumbing for DefaultMemoryMin
    
    Somehow these got lost in the previous PR, rendering DefaultMemoryMin
    not very useful.
    
    (cherry picked from commit 7e7223b3d57c950b399352a92e1d817f7c463602)
    
    Related: #1763435
    
    patch_name: 0410-cgroup-Readd-some-plumbing-for-DefaultMemoryMin.patch
    present_in_specfile: true
    location_in_specfile: 410
    squash_commits: true