oneshot services should only be run once

Still chasing root cause of openbmc/openbmc#3466 but either way, these
services should be configured to only ever run once. They do one-time
things and do not make sense to be run multiple times.

Change-Id: I595a0fafe654fff44702ec11bbffd1af8b299b64
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/recipes-phosphor/flash/openpower-software-manager/op-pnor-msl.service b/recipes-phosphor/flash/openpower-software-manager/op-pnor-msl.service
index dfd9e3c..92c599e 100644
--- a/recipes-phosphor/flash/openpower-software-manager/op-pnor-msl.service
+++ b/recipes-phosphor/flash/openpower-software-manager/op-pnor-msl.service
@@ -6,6 +6,7 @@
 Type=oneshot
 ExecStart=/usr/bin/env openpower-pnor-msl
 SyslogIdentifier=openpower-pnor-msl
+RemainAfterExit=yes
 
 [Install]
 WantedBy=obmc-flash-bios-updatesymlinks.service