83xx NAND boot: fix boards.cfg

This patch http://patchwork.ozlabs.org/patch/72962/ included a boards.cfg
change, but it was omitted when applied as
f1c574d4006d81301792e70fafc31ff39259e793

This fixes the NAND SPL build on MPC8315ERDB.

Signed-off-by: Scott Wood <scottwood@freescale.com>
1 file changed