Floss: Add restart bluetooth and apply ll privacy status

Add restart bluetooth to state machine and restart any enabled adapters
when ll privacy status is changed.

Restarting ProcessState can only transit from On. It will be no op for
other SM states. For example, a disabled adapter will stay disabled
after calling restart_bluetooth.

Bug: 242100561
Tag: #floss
Test: manual run dbus command to enable/disable ll privacy
Test: mma -j32

Change-Id: Ib1cba068aea9da47c1cbe7ce62e524e819f9de8f