tools: blob: implement get blob stat command

The firmware update process requires implementing the stat command, so
that one can verify the firmware mechanism requested is available.

Change-Id: I582f344124767975ee305c420657f991d2223889
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/tools/blob_handler.hpp b/tools/blob_handler.hpp
index fb2dcb5..fbc6fcb 100644
--- a/tools/blob_handler.hpp
+++ b/tools/blob_handler.hpp
@@ -51,6 +51,7 @@
     std::string enumerateBlob(std::uint32_t index);
 
     std::vector<std::string> getBlobList() override;
+    StatResponse getStat(const std::string& id) override;
 
   private:
     IpmiInterface* ipmi;