Add @UnsupportedAppUsage annotations for greylist.

go/cleanup-greylist-txt

These have already been greylisted, however due to bugs/omissions in the tooling have been kept in go/greylist-txt instead of being annotated in the code.

This is partial merge of aosp/Id6c1f5e403a0e66edb1102ee45f3bf19f244fb09. Telephony greylist cleanup has been done separately. Note that annotations outside of frameworks/base/ have been merged from AOSP.

Bug: 137350495
Test: m
Exempt-From-Owner-Approval: merge
Change-Id: I015c466e8b69cc0fed5e9d394ba865aad11d8ba6

core/java/android/net/ConnectivityManager.java

@@ -1763,6 +1763,9 @@ public class ConnectivityManager {
 
     /** @hide */
     public static class PacketKeepaliveCallback {
+        @UnsupportedAppUsage
+        public PacketKeepaliveCallback() {
+        }
         /** The requested keepalive was successfully started. */
         @UnsupportedAppUsage
         public void onStarted() {}

core/java/android/net/LinkProperties.java

@@ -111,6 +111,8 @@ public final class LinkProperties implements Parcelable {
     /**
      * @hide
      */
+    @UnsupportedAppUsage(implicitMember =
+            "values()[Landroid/net/LinkProperties$ProvisioningChange;")
     public enum ProvisioningChange {
         @UnsupportedAppUsage
         STILL_NOT_PROVISIONED,