This patch renames the smum header guards to align with the file name.
Reported-by: Edward O'Callaghan <funfunctor@folklore1984.net> Signed-off-by: Huang Rui <ray.huang@amd.com> Reviewed-by: Ken Wang <Qingqing.Wang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>