Add IPMI interface to allow FW updates from Host

New OEM IPMI command to execute commands that would allow the Host to have access to the BMC to perform a FW update.
diff --git a/oemhandler.h b/oemhandler.h
index 9cc397f..71ae01c 100644
--- a/oemhandler.h
+++ b/oemhandler.h
@@ -8,6 +8,7 @@
 // IPMI commands for net functions.
 enum ipmi_netfn_oem_cmds
 {
+    IPMI_CMD_PREP_FW_UPDATE = 0x10,
     IPMI_CMD_PESEL = 0xF0,
 };