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/tools/updater.cpp b/tools/updater.cpp
index 438fc4a..4d150db 100644
--- a/tools/updater.cpp
+++ b/tools/updater.cpp
@@ -16,14 +16,13 @@
 
 #include "updater.hpp"
 
-#include "firmware_handler.hpp"
+#include "flags.hpp"
 #include "handler.hpp"
 #include "status.hpp"
 #include "tool_errors.hpp"
 #include "util.hpp"
 
 #include <algorithm>
-#include <blobs-ipmid/blobs.hpp>
 #include <cstring>
 #include <ipmiblob/blob_errors.hpp>
 #include <memory>