Description: drm/nouveau/mmu: add more general vmm free/node handling functions
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2157270
Notes:
Bugs:
upstream: released (5.0-rc1) [729eba3355674f2d9524629b73683ba1d1cd3f10]
6.1-upstream-stable: N/A "Fixed before branch point"
5.10-upstream-stable: N/A "Fixed before branching point"
4.19-upstream-stable: needed
sid: released (5.2.6-1)
6.1-bookworm-security: N/A "Fixed before branch point"
5.10-bullseye-security: N/A "Fixed before branching point"
4.19-buster-security: needed