Add permission files gtest_db_media

:Release Notes:
Add two permission files (com.palm.db8_gtest_db_media.json.prv.in, com.palm.db8_gtest_db_media.json.pub.in)

:Detailed Notes:
Fix permissions for success run gtest_db_media

:Testing Performed:
tested on build

:QA Notes:

:Issues Addressed:
[GF-42590] gtest_db_media: permission issue

Open-webOS-DCO-1.0-Signed-off-by: Igor Kuksyuk <ikuksyuk@luxoft.com>

Change-Id: Ie96b26f3ef5498f3b27b4af8ace17a011e0f89f0
Reviewed-on: https://g2g.palm.com/3672
Reviewed-by: Build Verification
Tested-by: Maksym Sditanov <maxim.sditanov@lge.com>
Reviewed-by: Oleg Yablokov <oleg.yablokov@lge.com>
Reviewed-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Reviewed-by: Maksym Sditanov <maxim.sditanov@lge.com>