restriction_mode: switch to new settings API
restriction_mode: switch to new settings API

Resolves openbmc/openbmc#1489.

Change-Id: If642a19204edcf2dbebb644f7abd67de749491e4
Signed-off-by: Deepak Kodihalli <54105a30055f1e07853b8ee7a2f0d75d22ed98c1@in.ibm.com>

openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid