Fix LS2 security warnings on role files

:Release Notes:
The property "permissions" should be always present.

:Detailed Notes:

:Testing Performed:
Tested on TV

:QA Notes:

:Issues Addressed:
[GF-4814] Re-enable luna-service2 security

Open-webOS-DCO-1.0-Signed-off-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>

Change-Id: I552c9e60ecc18f14a532efaf9737d9b31f16421c
Reviewed-on: https://g2g.palm.com/3234
Reviewed-by: Build Verification
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>
Tested-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>
Reviewed-by: Keith Derrick <keith.derrick@lge.com>