board:tricorder: fixup SPL OOB layout

Commit d016dc42 changed the layout of BCH8 SW
on omap3 boards. We need to adopt the ecc layout for the nand_spl_simle
driver to avoid wrong ecc errors.

Signed-off-by: Andreas Bießmann <andreas.biessmann@corscience.de>
Cc: Thomas Weber <thomas.weber@corscience.de>

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>