openpower-software-manager: Move squashfsmount.service logic to script

The service files that manage the pnor ubi volumes and mount points are
starting to get too much logic in them. Move the logic to a shell script.

Change-Id: I4396bcd9fcfd253eeaa3a5ce00621d97386ff399
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
2 files changed