CMSettings: add CM_SETUP_WIZARD_COMPLETED key

We need to store the state of _our_ setup wizard.

To not break existing devices' provisioning, copy the current state of the global
provisioned flag to the new key value.

Ticket: CYNGNOS-2431

Change-Id: I3d88361edc126788f42b28efd11f3c7598117138
Signed-off-by: Roman Birg <roman@cyngn.com>
(cherry picked from commit bf5261c3)