tools: remove phosphor-ipmi-blobs dependency

The host tool depended on the BMC header: firmware_handler.hpp because
it defined the flags.  This header depends on phosphor-ipmi-blobs,
therefore the host-tool depends on this.  Move the flags into a separate
common header file and snip this dependency.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Id2ad33a1611c02605a1ed5c695429d0451eb98d4
diff --git a/bmc/test/firmware_createhandler_unittest.cpp b/bmc/test/firmware_createhandler_unittest.cpp
index dd09cbe..d7b99a6 100644
--- a/bmc/test/firmware_createhandler_unittest.cpp
+++ b/bmc/test/firmware_createhandler_unittest.cpp
@@ -1,5 +1,6 @@
 #include "data_mock.hpp"
 #include "firmware_handler.hpp"
+#include "flags.hpp"
 #include "image_mock.hpp"
 #include "triggerable_mock.hpp"
 #include "util.hpp"
@@ -26,8 +27,8 @@
     };
 
     std::vector<DataHandlerPack> data = {
-        {FirmwareBlobHandler::UpdateFlags::ipmi, nullptr},
-        {FirmwareBlobHandler::UpdateFlags::lpc, &dataMock},
+        {FirmwareFlags::UpdateFlags::ipmi, nullptr},
+        {FirmwareFlags::UpdateFlags::lpc, &dataMock},
     };
 
     auto handler = FirmwareBlobHandler::CreateFirmwareBlobHandler(