drm/amd/pm: remove some redundant smu message mapping for vangogh

This patch is to remove some redundant smu message mapping for vangogh.

Signed-off-by: Xiaojian Du <Xiaojian.Du@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>