CVE-2025-39717 open_tree_attr: do not allow id-mapping changes without OPEN_TREE_CLONE

In the Linux kernel, the following vulnerability has been resolved: opentreeattr: do not allow id-mapping changes without OPENTREECLONE As described in commit 7a54947e727b 'Merge patch series "fs: allow changing idmappings"', opentreeattr2 was necessary in order to allow for a detached mount to b...