mtd: nand: rename NAND_USE_FLASH_BBT

Recall the recently added prefix requirements:
 * "NAND_" for flags in nand.h, used in nand_chip.options
 * "NAND_BBT_" for flags in bbm.h, used in nand_chip.bbt_options
        or in nand_bbt_descr.options

Thus, I am changing NAND_USE_FLASH_BBT to NAND_BBT_USE_FLASH.

Again, this flag is found in bbm.h and so should NOT be used in the
"nand_chip.options" field.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

drivers/mtd/nand/mpc5121_nfc.c

@@ -736,7 +736,7 @@ static int __devinit mpc5121_nfc_probe(struct platform_device *op)
 	chip->verify_buf = mpc5121_nfc_verify_buf;
 	chip->select_chip = mpc5121_nfc_select_chip;
 	chip->options = NAND_NO_AUTOINCR;
-	chip->bbt_options = NAND_USE_FLASH_BBT;
+	chip->bbt_options = NAND_BBT_USE_FLASH;
 	chip->ecc.mode = NAND_ECC_SOFT;
 
 	/* Support external chip-select logic on ADS5121 board */