PEL: Add SRC callouts from message registry

When an SRC is being built for a new PEL, it will now also add callouts
from the message registry JSON for that error.

This commit only adds support for callouts of maintenance procedures or
symbolic FRUs.  A future commit will add support for calling out a
regular piece of hardware

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I78c0d3440c748f21145d452742e3aa682f26003b
diff --git a/test/openpower-pels/mocks.hpp b/test/openpower-pels/mocks.hpp
index 1654a9d..c003dd8 100644
--- a/test/openpower-pels/mocks.hpp
+++ b/test/openpower-pels/mocks.hpp
@@ -33,6 +33,7 @@
                 (const std::string&, std::string&, std::string&, std::string&,
                  std::string&),
                 (const override));
+    MOCK_METHOD(std::string, getSystemType, (), (const override));
 
     void changeHostState(bool newState)
     {