mtd: lpc32xx_slc: Adjust to pl08x DMA interface changes

This patch adjusts the LPC32xx SLC NAND driver to the new pl08x DMA interface,
fixing the compile error resulting from changed pl08x structures.

Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-By: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>