[preferences] Bug 437169: Allow privacy preferences to be exported

Change-Id: I457f43059b8a60938a4d0810ca7f1cf336680dda
Signed-off-by: Yasser Aziza <yasser.aziza@gmail.com>
Signed-off-by: Andreas Sewe <andreas.sewe@codetrails.com>
Signed-off-by: Johannes Dorn <johannes.dorn@codetrails.com>