Unhide RecoverableKeyStoreLoader API.

Bug: 66499222
Test: GTS tests under development
Change-Id: I4285beaa26bc94d92f6213a34eb1e41ad0994d7a
diff --git a/core/java/android/security/keystore/recovery/WrappedApplicationKey.java b/core/java/android/security/keystore/recovery/WrappedApplicationKey.java
index 2719137..f360bbe9 100644
--- a/core/java/android/security/keystore/recovery/WrappedApplicationKey.java
+++ b/core/java/android/security/keystore/recovery/WrappedApplicationKey.java
@@ -17,6 +17,8 @@
 package android.security.keystore.recovery;
 
 import android.annotation.NonNull;
+import android.annotation.SystemApi;
+
 import android.os.Parcel;
 import android.os.Parcelable;
 
@@ -36,6 +38,7 @@
  *
  * @hide
  */
+@SystemApi
 public final class WrappedApplicationKey implements Parcelable {
     private String mAlias;
     // The only supported format is AES-256 symmetric key.
@@ -143,9 +146,6 @@
                 }
             };
 
-    /**
-     * @hide
-     */
     @Override
     public void writeToParcel(Parcel out, int flags) {
         out.writeString(mAlias);