bmc_mode_enum: Add cstdint include to the header

Signed-off-by: Brandon Kim <brandonkim@google.com>
Change-Id: I47704b6684192cb1825682956b67b5ed3b41e911
diff --git a/bmc_mode_enum.hpp b/bmc_mode_enum.hpp
index be965dc..d264c3a 100644
--- a/bmc_mode_enum.hpp
+++ b/bmc_mode_enum.hpp
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <cstdint>
+
 namespace google
 {
 namespace ipmi