Merge "Only check exempted package list if standby is enabled." into rvc-dev am: 26bfc541 am: 654ad849 am: 04c26fdf

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11759032

Change-Id: I77feb3bee8219f6a28e2853fd06ed1a119ee5a6a