mtd: onenand: unexport onenand_default_bbt()

The onenand_default_bbt() function is only used by the OneNAND core
and not by drivers, so there is no real need to export
it. Additionally, the corresponding nand_default_bbt() for regular
NANDs is not exported either, so for consistency reasons, this commit
removes the EXPORT_SYMBOL on onenand_default_bbt().

Signed-off-by: Thomas Petazzoni <[e-mail]>
Reviewed-by: Boris Brezillon <[e-mail]>
Signed-off-by: Brian Norris <[e-mail]>

drivers/mtd/onenand/onenand_bbt.c

···
 
 	return onenand_scan_bbt(mtd, bbm->badblock_pattern);
 }
-
-EXPORT_SYMBOL(onenand_default_bbt);