PNOR: Create a service file for updating symlinks.

- Replace the functionality of updating the symlinks
  under openpower-pnor-code-mgmt to a service file.
- The new service has a dependency on mboxd.service.
  This allows us to only defer the symlink creation/update
  until the mboxd.service is started, which prevents
  symlink updates while HOST is running.

Change-Id: I8542aa24a9058af9560a32eec5140ff5ddee60d1
Signed-off-by: Saqib Khan <khansa@us.ibm.com>
diff --git a/meta-openbmc-machines/meta-openpower/common/recipes-phosphor/flash/openpower-software-manager.bb b/meta-openbmc-machines/meta-openpower/common/recipes-phosphor/flash/openpower-software-manager.bb
index 505250c..a463bd6 100644
--- a/meta-openbmc-machines/meta-openpower/common/recipes-phosphor/flash/openpower-software-manager.bb
+++ b/meta-openbmc-machines/meta-openpower/common/recipes-phosphor/flash/openpower-software-manager.bb
@@ -49,4 +49,5 @@
         obmc-flash-bios-ubipatch.service \
         obmc-flash-bios-squashfsmount@.service \
         obmc-flash-bios-ubiremount.service \
+        obmc-flash-bios-updatesymlinks.service \
         "