staging: tidspbridge: fix mgr_enum_node_info

The current code was always returning a non-zero status value
to userspace applications when this ioctl was called.

The error code was ENODATA, which isn't actually an error,
it's always returned by dcd_enumerate_object() when it hits the
end of list.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Omar Ramirez Luna <omar.ramirez@ti.com>