Revert "@hide ConnectionService APIs."

This reverts commit 86935c406e4a8bb0e2ad871b51009f3603df9e87.

telecomm/java/android/telecom/StatusHints.java

@@ -16,7 +16,6 @@
 
 package android.telecom;
 
-import android.annotation.SystemApi;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.pm.PackageManager;
@@ -30,9 +29,7 @@ import java.util.Objects;
 
 /**
  * Contains status label and icon displayed in the in-call UI.
- * @hide
  */
-@SystemApi
 public final class StatusHints implements Parcelable {
 
     private final ComponentName mPackageName;