cmd: nand: Extend nand info to print ecc information

Extract the information about ecc strength and ecc step size
from mtd controller. This information is usefull to check if
what we think as ecc is what we really configured.

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Reviewed-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://lore.kernel.org/all/20220922133937.277463-1-michael@amarulasolutions.com


Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>