DCMI : Implement Get System GUID command

Implemented IPMI Get System GUID command. It reads data
from the DBUS object which is in RFC4122(MSB) format and
converts to LSB format and returns.

Resolves openbmc/openbmc#2620

Change-Id: I95f0aa596695bf1f903b4c2cc1d64df80bdd3de9
Signed-off-by: Marri Devender Rao <devenrao@in.ibm.com>
diff --git a/apphandler.h b/apphandler.h
index 72997d9..89bb51b 100644
--- a/apphandler.h
+++ b/apphandler.h
@@ -14,6 +14,7 @@
     IPMI_CMD_RESET_WD               = 0x22,
     IPMI_CMD_SET_WD                 = 0x24,
     IPMI_CMD_GET_CAP_BIT            = 0x36,
+    IPMI_CMD_GET_SYS_GUID           = 0x37,
     IPMI_CMD_SET_CHAN_ACCESS        = 0x40,
     IPMI_CMD_GET_CHANNEL_ACCESS     = 0x41,
     IPMI_CMD_GET_CHAN_INFO          = 0x42,