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>
diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
index 370516c..ec28079 100644
--- a/drivers/mtd/nand/s3c2410.c
+++ b/drivers/mtd/nand/s3c2410.c
@@ -881,7 +881,7 @@
 	 * let the kernel fish out the BBT from the NAND, and also skip the
 	 * full NAND scan that can take 1/2s or so. Little things... */
 	if (set->flash_bbt) {
-		chip->bbt_options |= NAND_USE_FLASH_BBT;
+		chip->bbt_options |= NAND_BBT_USE_FLASH;
 		chip->options |= NAND_SKIP_BBTSCAN;
 	}
 }