Remove framework-connectivity-annotations library

This library can be removed because the annotations are no longer
used out of module.

@RestrictBackgroundStatus and @MultipathPreference are defined
in connectivity mainline module. Annotate these in non-updatable
platform is not going to be manageable long term. For example,
if the module gets updated and the annotation gets more values
then it's a problem in non-updatable platform. So, it should
not have IntDef cross module boundaries.

Ignore-AOSP-First: AOSP doesn't include this change yet
Bug: 183972925
Test: build
Change-Id: I63f1fde73c4ffdaff9fda914e33cbb5a110ba64e
diff --git a/service/src/com/android/server/ConnectivityService.java b/service/src/com/android/server/ConnectivityService.java
index 5c47f27..403b929 100644
--- a/service/src/com/android/server/ConnectivityService.java
+++ b/service/src/com/android/server/ConnectivityService.java
@@ -105,12 +105,12 @@
 import android.net.CaptivePortal;
 import android.net.CaptivePortalData;
 import android.net.ConnectionInfo;
-import android.net.ConnectivityAnnotations.RestrictBackgroundStatus;
 import android.net.ConnectivityDiagnosticsManager.ConnectivityReport;
 import android.net.ConnectivityDiagnosticsManager.DataStallReport;
 import android.net.ConnectivityManager;
 import android.net.ConnectivityManager.BlockedReason;
 import android.net.ConnectivityManager.NetworkCallback;
+import android.net.ConnectivityManager.RestrictBackgroundStatus;
 import android.net.ConnectivityResources;
 import android.net.ConnectivitySettingsManager;
 import android.net.DataStallReportParcelable;