tools: main: update ipmi-blob-tool constructors

ipmi-blob-tool changed the constructors to perform explicit ownership of
the inputs.  Therefore, update our constructions to obey this pattern.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I8029ce2ced3d75505f918a66afdc5fd61409c69d
diff --git a/tools/main.cpp b/tools/main.cpp
index 3b9760c..640016a 100644
--- a/tools/main.cpp
+++ b/tools/main.cpp
@@ -140,8 +140,8 @@
             exit(EXIT_FAILURE);
         }
 
-        ipmiblob::IpmiHandler ipmi;
-        ipmiblob::BlobHandler blob(&ipmi);
+        auto ipmi = ipmiblob::IpmiHandler::CreateIpmiHandler();
+        ipmiblob::BlobHandler blob(std::move(ipmi));
         host_tool::DevMemDevice devmem;
         host_tool::PciUtilImpl pci;