Hi @hyoungki,
Here we would suggest you to give assembly option for those pull down and do not assemble. The reason for same is newer SoC like iMX series they come with internal pull down so it is not required for same.
We have those resistors for our Colibri PXA series of SOMs.
I hope this will answer your query. If you have any question please feel free to reply.
Thanks & Best Regards
Ritesh Kumar