Merge "Only check exempted package list if standby is enabled." into rvc-dev...

Merge "Only check exempted package list if standby is enabled." into rvc-dev am: 26bfc541 am: 7f788258 am: e5f4526e am: cea2db31

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

Change-Id: I4ee8a60b4bdc35d0bc5eff748b8b15f317c804ca