uboot-phytec

nand_spl: Fix compile problem with board_nand_init() prototype

This patch removes the now obsolete and additionally wrongly defined
board_nand_init() prototype from nand_spl/nand_boot.c.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Scott Wood <scottwood@freescale.com>