mojoservice-frameworks: Fix WEBOS_GIT_TAG

:Release Notes:
Fix WEBOS_GIT_TAG and inherit webos_enhanced_submissions

:Detailed Notes:
mojoservice-frameworks doesn't have tag '3', but 'submissions/3'
$ git tag -l
1.0
submissions/2
submissions/3
versions/1.1

See recent change to librolegen (https://g2g.palm.com/#/c/3055 
3eb2c6275d92ccc925925578d350bc91f9e40037) for more details.

:Testing Performed:
Only build tested.

:QA Notes:
No change in image.

:Issues Addressed:
[GF-5328]  Improve build performance and allow to build completely from
           PREMIRROR
[GF-12492] Convert PREFERRED_VERSION to WEBOS_VERSION and modify
           webos_enhanced_submissions.bbclass

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>
Change-Id: I1b7687528a754ec25372eb17098216801fe421b2
Reviewed-on: https://g2g.palm.com/3056
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Tested-by: Susan Montooth <susan.montooth@lge.com>