Set early test case IPL step to be 14.7 in Axone simics

Currently in Axone simics we can boot up to exit_cache_contain
before failing.

Change-Id: I56ca91045c2645d69da5ba9cb18616db2a90706d
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/72721
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Matt Derksen <mderkse1@us.ibm.com>
Reviewed-by: William G. Hoffa <wghoffa@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/usr/targeting/common/xmltohb/simics_AXONE.system.xml

@@ -345,7 +345,7 @@
     </attribute>
     <attribute>
         <id>EARLY_TESTCASES_ISTEP</id>
-        <default>0x0609</default>
+        <default>0x0E07</default>
     </attribute>
 </targetInstance>