keyboard-efigs: Hide QA about already stripped libraries

:Release Notes:
Until it is fixed, hide the known warnings so that we can notice when
something causes new warnings.

:Detailed Notes:
Hides following warning:

keyboard-efigs-3.0.0-2: File '/usr/lib/luna/libkeyboard-efigs-phone.so'
from keyboard-efigs was already stripped, this will prevent future
debugging!
keyboard-efigs-3.0.0-2: File '/usr/lib/luna/libkeyboard-efigs-tablet.so'
from keyboard-efigs was already stripped, this will prevent future
debugging!

:Testing Performed:
Only build tested and checked in qa.log.

:QA Notes:
No change to image.

:Issues Addressed:
[GF-52560] Fix or hide all known QA issues to get clear qa.log from
           verification builds

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>

Change-Id: I3b1faa88f62414f6df69f7c3f371fc8818216b3f
Reviewed-on: https://g2g.palm.com/4029
Reviewed-by: DCO Verification
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>