bmc: add network bridge support

This data handler listens on a TCP port for the image bytes.

Signed-off-by: Benjamin Fair <benjaminfair@google.com>
Change-Id: I388fdd7303c5f8bc93a8f75e97b3abf8adbb81af
diff --git a/flags.hpp b/flags.hpp
index d7c89d5..2aca24c 100644
--- a/flags.hpp
+++ b/flags.hpp
@@ -15,6 +15,9 @@
         ipmi = (1 << 8), /* Expect to send contents over IPMI BlockTransfer. */
         p2a = (1 << 9),  /* Expect to send contents over P2A bridge. */
         lpc = (1 << 10), /* Expect to send contents over LPC bridge. */
+        /* New bridges starting with net densely pack the rest of the bits */
+        net = (1 << 11), /* Expect to send contents over network bridge. */
+        /* nextBridge = (2 << 11) */
     };
 };