This implementation allows U-Boot to save BBT table in NAND.
Without this option BBT table is created everytime when first nand
command is executed (except "nand dump"). Full scanning of NAND
takes long time and unnecessarily delays start of platform.
NOTE! This option is disabled by defaut as at startup it deletes last
two blocks of NAND. Most of people run code from RAM and don't have
NAND memory dumped yet. If you don't like to wait on first nand
command, you should define MT62XX_NAND_BBT_IN_NAND.
Signed-off-by: Marcin Mielczarczyk <marcin.mielczarczyk@tieto.com>
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