Description of problem:
There is an error message in source pod during migration with postcopy:

>

{"component":"virt-launcher","kind":"","level":"error","msg":"Live migration failed.","name":"vm-for-migration-policy-test-1670617033-538427","namespace":"virt-migration-and-maintenance-test-migration-polic","pos":"live-migration-source.go:817","reason":"error encountered during MigrateToURI3 libvirt api call: virError(Code=1, Domain=10, Message='internal error: unable to execute QEMU command 'migrate-set-capabilities': Postcopy is not supported')","timestamp":"2022-12-09T20:25:17.354513Z","uid":"20fc8ba6-a56f-4571-9993-5877034c371c"}

Version-Release number of selected component (if applicable):
4.12

How reproducible:

Steps to Reproduce:
1. create migration policy with `allowPostCopy: true`
2. create VM and migrate
3.

Actual results:
Migration failed, error message: Postcopy is not supported

Expected results:
Migration successful

Additional info: