utils: Do not export matrix utils

CMakeLists.txt

src/certificate.cpp

src/certificatemodel.cpp

src/keyexchangemodel.cpp

src/private/call_p.h

src/private/matrixutils.h

src/private/matrixutils.hpp

src/private/securityvalidationmodel_p.h

src/securityvalidationmodel.cpp

src/typedefs.h

src/useractionmodel.cpp