Add psr0 to afform extensions

ext/afform/admin/info.xml

@@ -28,6 +28,7 @@
   </civix>
   <classloader>
     <psr4 prefix="Civi\" path="Civi"/>
+    <psr0 prefix="CRM_" path="."/>
   </classloader>
   <mixins>
     <mixin>ang-php@1.0.0</mixin>

ext/afform/core/info.xml

@@ -24,6 +24,7 @@
   </civix>
   <classloader>
     <psr4 prefix="Civi\" path="Civi"/>
+    <psr0 prefix="CRM_" path="."/>
   </classloader>
   <requires>
     <ext>authx</ext>