Add POWER8 v2.0 and v2.1 to cpu map XML

From: <ro@suse.de>

Index: libvirt-4.6.0/src/cpu/cpu_map.xml
===================================================================
--- libvirt-4.6.0.orig/src/cpu/cpu_map.xml
+++ libvirt-4.6.0/src/cpu/cpu_map.xml
@@ -2361,6 +2361,8 @@
       <pvr value='0x004b0000' mask='0xffff0000'/>
       <pvr value='0x004c0000' mask='0xffff0000'/>
       <pvr value='0x004d0000' mask='0xffff0000'/>
+      <pvr value='0x004b0200' mask='0xffffffff'/>
+      <pvr value='0x004b0201' mask='0xffffffff'/>
     </model>
 
     <model name='POWER9'>