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/p2a.hpp b/tools/p2a.hpp
index 920422f..c84f12d 100644
--- a/tools/p2a.hpp
+++ b/tools/p2a.hpp
@@ -30,9 +30,9 @@
     }
 
     bool sendContents(const std::string& input, std::uint16_t session) override;
-    ipmi_flash::FirmwareBlobHandler::UpdateFlags supportedType() const override
+    ipmi_flash::FirmwareFlags::UpdateFlags supportedType() const override
     {
-        return ipmi_flash::FirmwareBlobHandler::UpdateFlags::p2a;
+        return ipmi_flash::FirmwareFlags::UpdateFlags::p2a;
     }
 
   private: