[Buildroot] Setting better names for partitions

[Fabio Estevam]

Hi Thomas and Arnout,

On Wed, Apr 15, 2020 at 4:27 AM Arnout Vandecappelle <arnout at mind.be> wrote:

>  It might make sense to change the default of that config to rootfs instead of
> empty. The aria and arietta defconfigs already override it to exactly that.

Thanks for your help! Now I get proper volume-labels.

I have sent two patches to address that.

Thanks