Updated backing build

Change-Id: I75fc317676462149785773839f161847cb573325
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/56290
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/fips920/Builds/b0314a_1813.920/
+export BACKING_BUILD=/esw/fips920/Builds/b0326a_1813.920/
 export SIMICSOPTIONS="-nre"