[MTD] [NAND] AT91 hardware ECC compile fix for at91sam9263 / at91sam9260

The sam926x docs allegedly don't list an "ECC_PARITY" field, and the 
header files in the upstream kernel don't have it either.

Masking with it was useless anyway, so just remove it.
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

drivers/mtd/nand/at91_nand.c

@@ -199,7 +199,7 @@ static int at91_nand_calculate(struct mtd_info *mtd,
 	unsigned int ecc_value;
 
 	/* get the first 2 ECC bytes */
-	ecc_value = ecc_readl(host->ecc, PR) & AT91_ECC_PARITY;
+	ecc_value = ecc_readl(host->ecc, PR);
 
 	ecc_code[eccpos[0]] = ecc_value & 0xFF;
 	ecc_code[eccpos[1]] = (ecc_value >> 8) & 0xFF;