firmware: move enum into class

This will protect the namespace from pollution, but also allow it to be
just a normal enum for arithmetic operations.

Change-Id: Ie4eab4040619b0c37ab0395b984437ebf3cf2101
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/test/firmware_stat_unittest.cpp b/test/firmware_stat_unittest.cpp
index 7d0961b..a00adf5 100644
--- a/test/firmware_stat_unittest.cpp
+++ b/test/firmware_stat_unittest.cpp
@@ -24,10 +24,10 @@
     };
 
     auto handler = FirmwareBlobHandler::CreateFirmwareBlobHandler(
-        blobs, static_cast<uint16_t>(FirmwareUpdateFlags::bt));
+        blobs, FirmwareBlobHandler::FirmwareUpdateFlags::bt);
     struct BlobMeta meta;
     EXPECT_TRUE(handler->stat("asdf", &meta));
-    EXPECT_EQ(static_cast<uint16_t>(FirmwareUpdateFlags::bt), meta.blobState);
+    EXPECT_EQ(FirmwareBlobHandler::FirmwareUpdateFlags::bt, meta.blobState);
 }
 
 } // namespace blobs