Add nyxSystem initialization in EraseHandler

:Release Notes:
Make luna://com.palm.systemservice/erase API functioning

:Detailed Notes:
Added initialization nyxSystem device handler based on similar
functionality in sleepd.

:Testing Performed:
Build for desktop.
Tested on qemux86 and got NYX_ERROR_NOT_IMPLEMENTED for both
EraseDeveloper and EraseAll. That confirmed by nyx-cmd.

:QA Notes:

:Issues Addressed:
[GF-46146] fail to send the erase API's command

Open-webOS-DCO-1.0-Signed-off-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Change-Id: I5de5a61a46171da1a59ddde4a8b2fbf27c24bf33
Reviewed-on: https://g2g.palm.com/3940
Reviewed-by: DCO Verification
Reviewed-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Tested-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>