Use new UnsupportedAppUsage annotation.

Existing annotations in libcore/ and frameworks/ will deleted after the migration. This also means that any java library that compiles @UnsupportedAppUsage requires a direct dependency on "unsupportedappusage" java_library.

Bug: 145132366
Test: m && diff unsupportedappusage_index.csv
Change-Id: I8789f8499d4dca08580672e9e45ed9a7026dd686
Merged-In: I8789f8499d4dca08580672e9e45ed9a7026dd686
diff --git a/core/java/android/app/usage/NetworkStatsManager.java b/core/java/android/app/usage/NetworkStatsManager.java
index 6bade90..7412970 100644
--- a/core/java/android/app/usage/NetworkStatsManager.java
+++ b/core/java/android/app/usage/NetworkStatsManager.java
@@ -21,8 +21,8 @@
 import android.annotation.Nullable;
 import android.annotation.SystemService;
 import android.annotation.TestApi;
-import android.annotation.UnsupportedAppUsage;
 import android.app.usage.NetworkStats.Bucket;
+import android.compat.annotation.UnsupportedAppUsage;
 import android.content.Context;
 import android.net.ConnectivityManager;
 import android.net.DataUsageRequest;