Merge "Allow doze dream package to start a DreamActivity" into rvc-dev am: 45387676fc am: 0a357617bb am: 5e495bcbed

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12066923

Change-Id: I3e02c89a6610287b499188d9d5ae0cd48a7bc797