Adjust never libvirt loaders

roles/virtualization/templates/vm.xml.j2

@@ -8,8 +8,8 @@
     <bootmenu enable='no'/>
     <boot dev='hd'/>
     <boot dev='cdrom'/>
-    <loader readonly="yes" type="pflash">/usr/share/edk2/x64/OVMF_CODE.secboot.fd</loader>
-    <nvram template="/usr/share/edk2/x64/OVMF_VARS.fd"/>
+    <loader readonly="yes" type="pflash">/usr/share/edk2/x64/OVMF_CODE.secboot.4m.fd</loader>
+    <nvram template="/usr/share/edk2/x64/OVMF_VARS.4m.fd"/>
   </os>
   <features>
     <acpi/>