nds32: Fix bogus reference to <asm/procinfo.h>

Andestech(nds32) never had <asm/procinfo.h>.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Greentime Hu <green.hu@gmail.com>
Signed-off-by: Greentime Hu <green.hu@gmail.com>