meta-webos: db8=98 cmake-modules-webos=19

:Release Notes:
db8:
Add the install location of the db8 media directory.

cmake-modules-webos:
Use command line argument to set path to mediadb.

:Detailed Notes:
db8: submissions/97..submissions/98
f64c3fb Use command line argument to set path to mediadb

cmake-modules-webos:
2349338 Add WEBOS_INSTALL_DB8MEDIADIR variable

:Testing Performed:
See test results on GF-52247.

:QA Notes:

:Issues Addressed:
[GF-52247] CCC: db8=98 cmake-modules-webos=19
[GF-51737] db8: Unhide directory /media/cryptofs/data/.db8
[GF-46437] [GFP2TestPass] Some service is logging messages with
           empty msgid

Open-webOS-DCO-1.0-Signed-off-by: Maksym Sditanov <maxim.sditanov@lge.com>

Change-Id: I54694d94846d4b3fb574593c7ff9083ae0906852
Reviewed-on: https://g2g.palm.com/3996
Reviewed-by: DCO Verification
Reviewed-by: Maksym Sditanov <maxim.sditanov@lge.com>
Tested-by: Maksym Sditanov <maxim.sditanov@lge.com>
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>