omap: Fix compile if MTD_NAND_OMAP2 is not selected

Fix compile if MTD_NAND_OMAP2 is not selected
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-flash.c

@@ -154,7 +154,7 @@ __init board_nand_init(struct mtd_partition *nand_parts,
 }
 #else
 void
-__init board_nand_init(struct mtd_partition *nand_parts, u8 nr_parts, u8 cs)
+__init board_nand_init(struct mtd_partition *nand_parts, u8 nr_parts, u8 cs, int nand_type)
 {
 }
 #endif /* CONFIG_MTD_NAND_OMAP2 || CONFIG_MTD_NAND_OMAP2_MODULE */