ARM: at91: enable on flash bbt for Atmel Reference and DT boards

Enable it on Calao board too as they are in DT too.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

arch/arm/mach-at91/board-sam9g20ek.c

@@ -167,6 +167,7 @@ static struct atmel_nand_data __initdata ek_nand_data = {
 	.enable_pin	= AT91_PIN_PC14,
 	.det_pin	= -EINVAL,
 	.ecc_mode	= NAND_ECC_SOFT,
+	.on_flash_bbt	= 1,
 	.parts		= ek_nand_partition,
 	.num_parts	= ARRAY_SIZE(ek_nand_partition),
 };