firmware: add read/write flags to enum

Add read/write flags to header the tool can access.

Note: Since this tool is meant to be run from the host and not the BMC,
it's not 100% clear how it'll be built and installed properly in this
configuration.

Change-Id: Ifbeab169026b6651b815b87b3c1950e73f8dfaae
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/firmware_handler.hpp b/firmware_handler.hpp
index 897606c..728fdca 100644
--- a/firmware_handler.hpp
+++ b/firmware_handler.hpp
@@ -71,6 +71,8 @@
   public:
     enum UpdateFlags : std::uint16_t
     {
+        openRead = (1 << 0),  /* Flag for reading. */
+        openWrite = (1 << 1), /* Flag for writing. */
         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. */