Merge "Initialise the brightness value with Float.NaN in PersistentDataStore"...

Merge "Initialise the brightness value with Float.NaN in PersistentDataStore" into tm-qpr-dev am: 0736fbfd am: 65574a3c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20609229



Change-Id: Ieccf30f1046c78da10ab14d4ec8e6461d152a0ec
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>