[U-Boot] [PATCH 2/3] fsl_elbc_nand: implement support for flash-based BBT

[Scott Wood]

From: Anton Vorontsov <avorontsov at ru.mvista.com>

This patch implements support for flash-based BBT for chips working
through ELBC NAND controller, so that NAND core will not have to re-scan
for bad blocks on every boot.

Because ELBC controller may provide HW-generated ECCs we should adjust
bbt pattern and bbt version positions in the OOB free area.

Signed-off-by: Anton Vorontsov <avorontsov at ru.mvista.com>
Signed-off-by: David Woodhouse <David.Woodhouse at intel.com>
Signed-off-by: Scott Wood <scottwood at freescale.com>
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