Device Controls - Supporting activity launch

Make sure to dismiss the keyguard prior to launching supporting
activities. Otherwise the keyguard will remain and leave the user in
a loop of trying to add/edit controls without the means to do so.

Fixes: 199882607
Test: manual - swipe security, attempt to "Add Controls" from lockscreen
Change-Id: Ic157d91004af68b191a62124726bfdbb54ca9ac9