Implement a Command To Get PSU Version

Implement an IPMI command to get PSU version.

Tested:
Run ipmitool raw 0x30 0xef
returns: 03 32 01 03 32 01

Signed-off-by: Cheng C Yang <cheng.c.yang@linux.intel.com>
Change-Id: I087b7786b7dd669f5b1eecb8a9bc9647362fd207
diff --git a/include/oemcommands.hpp b/include/oemcommands.hpp
index c664a48..9612ca5 100644
--- a/include/oemcommands.hpp
+++ b/include/oemcommands.hpp
@@ -76,6 +76,7 @@
 static constexpr Cmd cmdSetEfiBootOptions = 0xEA;
 static constexpr Cmd cmdGetEfiBootOptions = 0xEB;
 static constexpr Cmd cmdSetNmiStatus = 0xED;
+static constexpr Cmd cmdGetPSUVersion = 0xEF;
 } // namespace general
 
 namespace platform