Update config files.
    
    Disable CONFIG_BLK_CGROUP_IOPRIO.
    
    io.prio.class is a misdesigned mechanism that doesn't fit well with the
    cgroup (especially v2):
    
    - it's not properly hierarchical
        - cgroup-wise: parent cgroup has no contol over child cgroup
        - task-wise: priority impact outside of a cgroup (i.e. affects
          cousins competition)
    - it's not device dependent (device oblivious)
    
    Disable it in openSUSE Tumbleweed (and future products) so that we don't
    teach users to use it and force ourselves to support it.