mtd: davinci_nand: convert to mtd_device_register()

Convert to mtd_device_register() and remove the check for
mtd_has_partitions() as partitioning is always available.

Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>