shutdown: request saved files be cleaned

We don't need to hold saved files for a future restore.

Signed-off-by: Milton Miller <miltonm@us.ibm.com>
diff --git a/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh b/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh
index 7d79cf0..8d5d0c9 100644
--- a/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh
+++ b/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh
@@ -43,7 +43,7 @@
 then
 	if test -x $update
 	then
-		$update
+		$update --clean-saved-files
 	else
 		echo 1>&2 "Flash update requested but $update program missing!"
 	fi