11.9.7

This release corresponds to upstream PDA repository tag 11.9.7. (at the time of writing, no tag yet, so taken from branch bug_sched_atomic).

For historical reasons, the previous work on initial fork was tagged 12.0.0 in the O2 repo.
As the code base is now synchronized, it seems easier to switch back to the upstream numbering.
For convenience, this release is also tagged 12.1.1, to have an incremental O2 numbering.

Only addition to this fork is a new recipe to build pda-kadapter-dkms RPM.