[MAMDA] Removing duplicated FieldUpdate structs
[MAMDA] Removing duplicated FieldUpdate structs

Looks like these were added in by mistake in commit 4cd88bbf.

Causes a build error with recent clang versions.

Signed-off by: Damian Maguire <damian.j.maguire@gmail.com>

fquinner/OpenMAMA,fquinner/OpenMAMA,fquinner/OpenMAMA,fquinner/OpenMAMA,fquinner/OpenMAMA,fquinner/OpenMAMA,fquinner/OpenMAMA