ipmi: start implementing flashHashFinish

Change-Id: I354b346bcd2d0dd141fd21a84e57cd7c06eadc1a
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/test/updater_mock.hpp b/test/updater_mock.hpp
index 1e03a31..fa912ea 100644
--- a/test/updater_mock.hpp
+++ b/test/updater_mock.hpp
@@ -15,4 +15,5 @@
     MOCK_METHOD0(flashFinish, bool());
     MOCK_METHOD1(startHash, bool(uint32_t));
     MOCK_METHOD2(hashData, bool(uint32_t, const std::vector<uint8_t>&));
+    MOCK_METHOD0(hashFinish, bool());
 };