webos_enhanced_submissions: Use webos-enh-sub-autorev-error for AUTOREV

:Release Notes:
Use separate key for QA check about AUTOREV in WEBOS_VERSION, so that
it's easier to change it for some buidls.

:Detailed Notes:
Include webos-enh-sub-autorev-error in WARN for unofficial builds and in
ERROR for official builds.

:Testing Performed:
Only build tested.

:QA Notes:
No change to image.

:Issues Addressed:
[ANG-679] QA ERROR regarding use of AUTOINC should only be a warning for
          local developer builds
[ANG-1886] CCC: Allow the branch to be specified in WEBOS_VERSION

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>
Change-Id: I39fe213ed698d71ee1ed70913b61c2ba3686dd4f
Reviewed-on: https://g2g.palm.com/4711
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Tested-by: Susan Montooth <susan.montooth@lge.com>
Reviewed-by: DCO Verification