CI: use path to avoid warning

Warnings are being seen in gitlab of
 WARNING  - Falling back to file-relative addressing of local include "base.yml"
 WARNING  - Update your layer to repo-relative addressing to avoid this warning
 WARNING  - Falling back to file-relative addressing of local include "meta-openembedded.yml"
 WARNING  - Update your layer to repo-relative addressing to avoid this warning

Make the relevant changes to resolve this issue

Signed-off-by: Jon Mason <jon.mason@arm.com>
Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>