mboxd: Put Wants/After directives in Unit section of service file

Change-Id: I2ff9d165d149e6c76a6b68298d8e84564d39d579
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/common/recipes-phosphor/mboxd/mboxd/mboxd.service b/common/recipes-phosphor/mboxd/mboxd/mboxd.service
index 5a10b95..7dc5c50 100644
--- a/common/recipes-phosphor/mboxd/mboxd/mboxd.service
+++ b/common/recipes-phosphor/mboxd/mboxd/mboxd.service
@@ -1,11 +1,11 @@
 [Unit]
 Description=Phosphor MBOX Daemon
+Wants=dev-aspeed-mbox.device
+After=dev-aspeed-mbox.device
 
 [Service]
 Restart=always
 ExecStart={sbindir}/mboxd --flash {FLASH_SIZE} --verbose
-Wants=dev-aspeed-mbox.device
-After=dev-aspeed-mbox.device
 
 [Install]
 WantedBy={SYSTEMD_DEFAULT_TARGET}