new command: BmcBlobWriteMeta

Implement new command BmcBlobWriteMeta.

Change-Id: I2e148f4bde4ef5d24db7e30bb02bdde024d9166a
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/example/example.cpp b/example/example.cpp
index c17d71d..929e4d1 100644
--- a/example/example.cpp
+++ b/example/example.cpp
@@ -117,6 +117,13 @@
     return true;
 }
 
+bool ExampleBlobHandler::writeMeta(uint16_t session, uint32_t offset,
+                                   const std::vector<uint8_t>& data)
+{
+    /* Not supported. */
+    return false;
+}
+
 bool ExampleBlobHandler::commit(uint16_t session,
                                 const std::vector<uint8_t>& data)
 {