Add new google ipmi sys command: SysHostPowerOff

New google ipmi sys command to let the BMC knows host shutdown,
allow host to gracefully shutdown and disable the watchdog with given
time delay.

Signed-off-by: Yunyun Lin <linyuny@google.com>
Change-Id: I02171c9cfed57ae5d10d66b515e4ab7ee8856466
diff --git a/commands.hpp b/commands.hpp
index d9efb4f..08ab21b 100644
--- a/commands.hpp
+++ b/commands.hpp
@@ -27,6 +27,8 @@
     SysPsuHardResetOnShutdown = 8,
     // The Sys get flash size command
     SysGetFlashSize = 9,
+    // The Sys Host Power Off with disabled fallback watchdog
+    SysHostPowerOff = 10,
 };
 
 } // namespace ipmi