firmware: add sdbusplus for use by verification

The verification process starts a systemd service implemented outside
the scope of this codebase.  Therefore, add sdbusplus to the build and
inject into the object.

Change-Id: Icaacb5d60334da78f6363682f3b97714eb482dcf
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/main.cpp b/main.cpp
index 40f4b52..3130eec 100644
--- a/main.cpp
+++ b/main.cpp
@@ -26,6 +26,7 @@
 #include <cstdint>
 #include <memory>
 #include <phosphor-logging/log.hpp>
+#include <sdbusplus/bus.hpp>
 
 namespace blobs
 {
@@ -82,7 +83,8 @@
     using namespace phosphor::logging;
 
     auto handler = blobs::FirmwareBlobHandler::CreateFirmwareBlobHandler(
-        blobs::supportedFirmware, blobs::supportedTransports);
+        sdbusplus::bus::new_default(), blobs::supportedFirmware,
+        blobs::supportedTransports);
 
     if (!handler)
     {