ARM: imx: Fix typo 'MACH_MX31_3DS_MXC_NAND_USE_BBT'

Signed-off-by: NPaul Bolle <pebolle@tiscali.nl>
Tested-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

arch/arm/mach-imx/mach-mx31_3ds.c

@@ -542,7 +542,7 @@ static const struct mxc_nand_platform_data
 mx31_3ds_nand_board_info __initconst = {
 	.width		= 1,
 	.hw_ecc		= 1,
-#ifdef MACH_MX31_3DS_MXC_NAND_USE_BBT
+#ifdef CONFIG_MACH_MX31_3DS_MXC_NAND_USE_BBT
 	.flash_bbt	= 1,
 #endif
 };