LampTest: Notify PHYP to start the lamp test

- As part of the lamp test, when the lamp test is started / stoped,
  the BMC needs to notify PHYP, so that PHYP can do lamp test on
  externally connected drawers.
  For example: MEX IO drawers.

- Since the command to notify PHYP needs to be completed in the PLDM
  daemon, ledManager only needs to update the corresponding D-Bus
  interface property value.

Tested:
- Notify PHYP by the host-lamp-test path
  busctl set-property xyz.openbmc_project.LED.GroupManager
  /xyz/openbmc_project/led/groups/host_lamp_test
  xyz.openbmc_project.Led.Group Asserted b true

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I0a0aad91c512183e457903bddb392ee56118f21c
3 files changed