Update backing build

Change-Id: I19ba07e021002985ddff66a5d699751d364e4636
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/66200
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/b0404b_1813.920/
+export BACKING_BUILD=/esw/fips910/Builds/b0914a_1836.910/
 export SIMICSOPTIONS="-nre"