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.