webos-image: Add core-apps and services into System Apps package set

:Release Notes:
Add these apps and services into System Apps package set
 * core-apps
 * app-services
 * mojolocation-stub
 * mojomail

:Detailed Notes:

:Testing Performed:
Ran miniBAT

:QA Notes:

:Issues Addressed:
[GF-35149] CCC: Move core-apps and services into System Apps package set

 Open-webOS-DCO-1.0-Signed-off-by: Suresh Arumugam <suresh.arumugam@lge.com>

Change-Id: I3f10f6dd27d4441e9effc19d5b9289357bb0a973
Reviewed-on: https://g2g.palm.com/3260
Reviewed-by: Build Verification
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Tested-by: Susan Montooth <susan.montooth@lge.com>