Autoenabling gesture mode only is the device is unmanaged

> Adding a protected broadcast to enable gesture mode

If the device is not managed, gesture mode will be wnabled once setup-wizard
finishes. Otherwise, it will wait for a protected broadcast from the device/profile
owner app which can switch the device to gesture mode.

Bug: 134473386
Test: Verified on device setup in device owner and profile owner mode
Change-Id: I7d32d5461eef19a30f323295c7a9bac975adbf91