Add support for IPMI Get Boot Options command

Create new Chassis NetFn file and add basic support
for OPAL to call the IPMI Get Boot Options command.
diff --git a/chassishandler.h b/chassishandler.h
new file mode 100644
index 0000000..99ed366
--- /dev/null
+++ b/chassishandler.h
@@ -0,0 +1,17 @@
+#ifndef __HOST_IPMI_CHASSIS_HANDLER_H__
+#define __HOST_IPMI_CHASSIS_HANDLER_H__
+
+// IPMI commands for Chassis net functions.
+enum ipmi_netfn_app_cmds
+{
+    // Get capability bits
+    IPMI_CMD_GET_SYS_BOOT_OPTIONS = 0x09,
+};
+
+// Command specific completion codes
+enum ipmi_chassis_return_codes
+{
+    IPMI_CC_PARM_NOT_SUPPORTED = 0x80,
+};
+
+#endif