webos-image: luna-prefs=r11

:Release Notes:
Don't add /etc/prefs/public_properties file

:Detailed Notes:
We don't want to send the device nduid (which is created from device mac
address) on the public bus. So remove it from the file
/etc/prefs/public_properties file and since that's the only entry in this file
as of now, just skip adding this file altogether in the luna-prefs.bb file.

:Testing Performed:
Verified that in the absence of /etc/prefs/public_properties, the property
com.palm.properties.nduid is seen only on private bus and not on public
bus.

:Issues Addressed:
[ANG-1756] Security Review: com.palm.preferences
[ANG-2582] CCC: luna-prefs=r11

Open-webOS-DCO-1.0-Signed-off-by: Sapna Todwal <sapna.todwal@lge.com>

Change-Id: Ic7d77e5ac52e07053a061949036259b5317d3880
Reviewed-on: https://g2g.palm.com/4834
Reviewed-by: DCO Verification
Build: Sapna Todwal <sapna.todwal@lge.com>
Reviewed-by: Build Verification
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Sapna Todwal <sapna.todwal@lge.com>
Reviewed-by: Alexander Irhin <alexander.irhin@lge.com>