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: 654ad849 am: 04c26fdf am: 492fbc2f

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

Change-Id: I4383492416fc3b1652f254e033a1b94ef47f9de7