ARM: platform data to use the FSMC NAND with the U300

Just as it says, if this is merged along with the other patch, the
driver supports the U300 NAND flash interface.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>