blobs-ipmid: use enum class for BlobOEMCommands

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Ic5aa3e38b4df33a2cfa29c575f17097e38d06605
diff --git a/blobs-ipmid/blobs.hpp b/blobs-ipmid/blobs.hpp
index dbeac21..e75495b 100644
--- a/blobs-ipmid/blobs.hpp
+++ b/blobs-ipmid/blobs.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdint>
 #include <memory>
 #include <string>
 #include <vector>
@@ -7,7 +8,7 @@
 namespace blobs
 {
 
-enum BlobOEMCommands
+enum class BlobOEMCommands : std::uint8_t
 {
     bmcBlobGetCount = 0,
     bmcBlobEnumerate = 1,