oem-ibm: Send the event to host when BIOS attribute changes

IBM has the requirement to send a hot update to host when the
BIOS attribute changes. This patch enables sending an OEM platform
event message to host with the details of the BIOS attributes that
changed on the BMC. Once the host acknowledges the event, then BMC
updates the BaseBiosTable in the bios-config-manager. The host comes
down and reads the changed BIOS attributes by calling the command
GetBIOSAttribute value.

Signed-off-by: Tom Joseph <tomjoseph@in.ibm.com>
Change-Id: Id1579bfed1967e653da743313c825b765d227681
diff --git a/libpldm/platform.h b/libpldm/platform.h
index bd4d557..1db7aee 100644
--- a/libpldm/platform.h
+++ b/libpldm/platform.h
@@ -33,6 +33,7 @@
 #define PLDM_PLATFORM_EVENT_MESSAGE_MIN_REQ_BYTES 3
 #define PLDM_PLATFORM_EVENT_MESSAGE_STATE_SENSOR_STATE_REQ_BYTES 6
 #define PLDM_PLATFORM_EVENT_MESSAGE_RESP_BYTES 2
+#define PLDM_PLATFORM_EVENT_MESSAGE_FORMAT_VERSION 1
 
 /* Minumum length of senson event data */
 #define PLDM_SENSOR_EVENT_DATA_MIN_LENGTH 5