cpu_map: rename x86_EPYC-IBRS file to x86_EPYC-IBPB

The later is the correct CPU model name.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

src/cpu_map/Makefile.inc.am

@@ -22,7 +22,7 @@ cpumap_DATA = \
 	cpu_map/x86_cpu64-rhel5.xml \
 	cpu_map/x86_cpu64-rhel6.xml \
 	cpu_map/x86_EPYC.xml \
-	cpu_map/x86_EPYC-IBRS.xml \
+	cpu_map/x86_EPYC-IBPB.xml \
 	cpu_map/x86_Haswell.xml \
 	cpu_map/x86_Haswell-IBRS.xml \
 	cpu_map/x86_Haswell-noTSX.xml \

src/cpu_map/index.xml

@@ -58,7 +58,7 @@
     <include filename="x86_Opteron_G4.xml"/>
     <include filename="x86_Opteron_G5.xml"/>
     <include filename="x86_EPYC.xml"/>
-    <include filename="x86_EPYC-IBRS.xml"/>
+    <include filename="x86_EPYC-IBPB.xml"/>
   </arch>
 
   <arch name='ppc64'>