tisdk-image.bbclass: use _append to ensure cleanup is last in task list
tisdk-image.bbclass: use _append to ensure cleanup is last in task list

Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>

rcn-ee/meta-arago,rcn-ee/meta-arago,rcn-ee/meta-arago,rcn-ee/meta-arago,rcn-ee/meta-arago