[IPMI]Set/Get global enables

Recv Message Queue and SEL are enabled by default.
Event Message buffer are disabled by default (not supported).
Any request that try to change the mask will be rejected.

Test:
test pass with ipmitool

Change-Id: Ia6bd4a6bf7b2b04dcfde6bfec910ca854a7aaeb8
Signed-off-by: Jia, Chunhui <chunhui.jia@linux.intel.com>
diff --git a/systemintfcmds.hpp b/systemintfcmds.hpp
index c0b3318..4eb30be 100644
--- a/systemintfcmds.hpp
+++ b/systemintfcmds.hpp
@@ -19,6 +19,7 @@
 enum ipmi_netfn_system_intf_cmds
 {
     IPMI_CMD_SET_BMC_GLOBAL_ENABLES = 0x2E,
+    IPMI_CMD_GET_BMC_GLOBAL_ENABLES = 0x2F,
     IPMI_CMD_GET_MSG_FLAGS = 0x31,
     IPMI_CMD_READ_EVENT = 0x35,
 };