Removed duplicate registration of base package (#810)

plugins/org.yakindu.base.types/plugin.xml

@@ -12,13 +12,4 @@
             uri="http://www.yakindu.org/base/base/2.0.0">
       </package>
    </extension>
-
-   <extension point="org.eclipse.emf.ecore.generated_package">
-      <!-- @generated base -->
-      <package
-            uri="http://www.yakindu.org/base/base/2.0.0"
-            class="org.yakindu.base.base.BasePackage"
-            genModel="model/base.genmodel"/>
-   </extension>
-
 </plugin>