ARM Nomadik: use new OneNand name and pdata

This enables the onenand with the new platform device name.
Moreover, it fixes a related typo that doesn't deserve a
separate patch.

Signed-off-by: Alessandro Rubini <rubini@unipv.it>
Acked-by: Andrea Gallo <andrea.gallo@stericsson.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>