Fix lock icon missing on hub

Adds transition models for PRIMARY_BOUNCER->HUB and DOZING->HUB states
which were previously missing. This ensures the lock icon is always
shown when we transition to the hub from one of these states.

Fixes: 349171893
Test: verified on-device that going from hub->secondary bouncer->primary
bouncer->hub will still show the lock icon
Flag: com.android.systemui.communal_hub

Change-Id: Ib8355c89ca868d5cdfef0e7e0763f986b7b69330