[PATCH 01/09, nds32] Committed: Add several new files for preparation of providing modules that are going to be separated from nds32.c source.

[Chung-Ju Wu]

Hi,

This patch is the preparation for subsquent patches of modules
implementation.  In addition to create several empty source files,
we also need to modify config.gcc and provide t-nds32 makefile fragment.

Committed as Rev.212280.
  https://gcc.gnu.org/r212280


Best regards,
jasonwucj