Only transition to GH from dreaming if charging/postured/docked

If the device is picked up while dreaming, the dream will remain on the
screen. This ensures we go to lockscreen when the user exits the dream
instead of going to hub if they are no longer charging/postured/docked.

Bug: 383208131
Test: mp droid and verified dream exit behavior
Flag: com.android.systemui.glanceable_hub_v2
Change-Id: Ie6cc079b829c2615abe4dd368beae865f851ac2a