tisdk-image: enhance cleanup of image
tisdk-image: enhance cleanup of image

* The upstream image class is creating many more directories and file
  by default in an image.
* As this SDK image is not a filesystem, we do not need these
  defaults.
* Clean up these directories and files using a customizable list.

Signed-off-by: Jacob Stiffler <0ec61db87821c27ca8ee6f3e24c6f93fdbb785d4@ti.com>
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