From Andreas Böhler:
"Some revisions of the FRITZ!7530 use a Toshiba NAND with 8 bit ECC
in contrast to the Macronix NAND with 4 bit ECC.".
Uboot needs to know this in order to have a chance to load from
the NAND.
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
(cherry picked from commit 057bac2e1fc796fb4b2440a896be43bca138be84)