LockPatternView: persist state across rotates

We need to persist and restore the activity states across rotates so the
user doesn't have to restart from the beginning.

Ref: CYNGNOS-141

Change-Id: I18458d55748666b439cf7b6fcecd81ee5c4c7865
Signed-off-by: Roman Birg <roman@cyngn.com>
(cherry picked from commit bdc83b4a)