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

From: <ro@suse.de>

Index: libvirt-7.4.0/src/cpu_map/ppc64_POWER8.xml
===================================================================
--- libvirt-7.4.0.orig/src/cpu_map/ppc64_POWER8.xml
+++ libvirt-7.4.0/src/cpu_map/ppc64_POWER8.xml
@@ -4,5 +4,7 @@
     <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>
 </cpus>