Fix logic of systemTimeSource

:Release Notes:
System-wide now associated with "factory" during that short period
after boot start and before "micom" time received.

:Detailed Notes:
Reading of saved last system time source is moved to moment when
"micom" received.

:Testing Performed:
Desktop build with NTP restored from "micom" (sent manually).

:QA Notes:

:Issues Addressed:
[GF-59163] systemTimeSource shows wrong time source right after re-start

Open-webOS-DCO-1.0-Signed-off-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Change-Id: I9f948b07232257b6ee43d0a4b995cd06707a906c
Reviewed-on: https://g2g.palm.com/4461
Reviewed-by: DCO Verification
Reviewed-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Tested-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Reviewed-by: Alexandr Smoktal <alexandr.smoktal@lge.com>
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>