Unhide CredentialEntry constructor.

CredentialEntry has a different constructor to be used by
CredentialProviders when using Credential Registry APIs.
Unhiding that so it can be used.

Bug: 271486804
Test: local
Change-Id: I2878a30403230aec7a163750d16a374088d96ee5

core/api/current.txt

@@ -40641,6 +40641,7 @@ package android.service.credentials {
 
   public class CredentialEntry implements android.os.Parcelable {
     ctor public CredentialEntry(@NonNull android.service.credentials.BeginGetCredentialOption, @NonNull android.app.slice.Slice);
+    ctor public CredentialEntry(@NonNull String, @NonNull android.app.slice.Slice);
     method public int describeContents();
     method @NonNull public android.service.credentials.BeginGetCredentialOption getBeginGetCredentialOption();
     method @NonNull public android.app.slice.Slice getSlice();

core/java/android/service/credentials/CredentialEntry.java

@@ -97,9 +97,7 @@ public class CredentialEntry implements Parcelable {
      * @param slice the slice containing the metadata to be shown on the UI. Must be
      *              constructed through the androidx.credentials jetpack library.
      *
-     * @hide
      */
-    // TODO: Unhide this constructor when the registry APIs are stable
     public CredentialEntry(@NonNull String type, @NonNull Slice slice) {
         mBeginGetCredentialOption = null;
         mType = requireNonNull(type, "type must not be null");