Fix PLDM dependency string

After systemd daemon-reload an error was found:
  open_power.OCC.Control.service:7: Failed to add dependency on xyz.openbmc_project.PLDM, ignoring: Invalid argument

Change-Id: Id1c6ff9661347e3b7dc3e6d764dbe5ef4dc451bd
Signed-off-by: Chris Cain <cjcain@us.ibm.com>
1 file changed