Fixes Android on launch performance issue
https://github.com/oblador/react-native-keychain/issues/314#issuecomment-736640077

diff --git a/node_modules/react-native-keychain/android/src/main/java/com/oblador/keychain/KeychainModule.java b/node_modules/react-native-keychain/android/src/main/java/com/oblador/keychain/KeychainModule.java
index 6ca68cb..a600f38 100644
--- a/node_modules/react-native-keychain/android/src/main/java/com/oblador/keychain/KeychainModule.java
+++ b/node_modules/react-native-keychain/android/src/main/java/com/oblador/keychain/KeychainModule.java
@@ -140,13 +140,7 @@ public class KeychainModule extends ReactContextBaseJavaModule {
     super(reactContext);
     prefsStorage = new PrefsStorage(reactContext);

-    addCipherStorageToMap(new CipherStorageFacebookConceal(reactContext));
     addCipherStorageToMap(new CipherStorageKeystoreAesCbc());
-
-    // we have a references to newer api that will fail load of app classes in old androids OS
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-      addCipherStorageToMap(new CipherStorageKeystoreRsaEcb());
-    }
   }

   /** Allow initialization in chain. */