Removing the UnsupportedAppUsage annotation from Choreographer

Removing the UnsupportedAppUsage annotation according to
https://googleplex-android-review.git.corp.google.com/c/platform/frameworks/base/+/12517216/11/core/java/android/view/DisplayEventReceiver.java#158

Test: build
Bug: 162890382
Bug: 162888881
Bug: 162890407
Change-Id: I1bf8edceb52e9f4cf3f24bf9f6b9e3eb8d8ef01b