add PIN as a SecretKeyType

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/ProviderHelper.java

@@ -682,6 +682,11 @@ public class ProviderHelper {
                                         KeyFormattingUtils.convertKeyIdToHex(id)
                                 );
                                 break;
+                            case PIN:
+                                log(LogType.MSG_IS_SUBKEY_PIN,
+                                        KeyFormattingUtils.convertKeyIdToHex(id)
+                                );
+                                break;
                             case GNU_DUMMY:
                                 log(LogType.MSG_IS_SUBKEY_STRIPPED,
                                         KeyFormattingUtils.convertKeyIdToHex(id)