pldm_events: Update PlatformEventMessage implementation
pldm_events: Update PlatformEventMessage implementation

The PlatformEventMessage command implementation is extended to handle
PLDM events for state sensors for which PDR is available. The sensor
info is looked up with the HostPDRHandler and the BMC action is looked
up in the StateSensorHandler

Signed-off-by: Tom Joseph <ccebe3ea0dc9f732d049c731e46285897e145ffb@in.ibm.com>
Change-Id: I6ff5c31bf05dc4b31f39ac25b6e1b399766013b6

openbmc/pldm,openbmc/pldm,openbmc/pldm