This patch extends NDFC driver to support all 4 chip selects
available in NDFC NAND controller. Tested on custom 460EX board
with 2 chip select NAND device.

Artem: white-space cleanups
Signed-off-by: NFelix Radensky <felix@embedded-sol.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>