create 32M habanero_update.pnor image for HPM updates

RTC: 124337
diff --git a/openpower/package/openpower-pnor/Config.in b/openpower/package/openpower-pnor/Config.in
index 8815490..6a23e51 100644
--- a/openpower/package/openpower-pnor/Config.in
+++ b/openpower/package/openpower-pnor/Config.in
@@ -24,6 +24,11 @@
         help
             String used to define pnor filename to be created
 
+config BR2_OPENPOWER_PNOR_UPDATE_FILENAME
+        string "Name of pnor file to be created for updates, if needed"
+        help
+            String used to define pnor filename to be created for updates, if needed
+
 config BR2_SKIBOOT_LID_NAME
         string "Name of skiboot lid name to be used"
         default "skiboot.lid"