Update backing build

Change-Id: I0bbadf0b756b2ed4e94365f634b0c95262945025
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/55924
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>

customrc

@@ -33,6 +33,6 @@ export SANDBOXNAME=test_sb
 #export WORKSPACE=<set it to your root ppe directory. This is required if you
 #                  to use build script locally>
 export MACHINE=NIMBUS
-export BACKING_BUILD=/esw/fips911/Builds/b0309a_1812.911/
+export BACKING_BUILD=/esw/fips920/Builds/b0314a_1813.920/
 export SIMICSOPTIONS="-nre"