Incorporate DMA driver from legacy LPCLinux NXP BSP.
The files taken from the legacy patch are:
- lpc32xx DMA driver
- lpc3250 header file DMA registers definition.

The legacy driver was updated and clean-up as part of the integration with the latest u-boot.
Signed-off-by: NSylvain Lemieux <slemieux@tycoint.com>
Acked-by: NMarek Vasut <marex@denx.de>
Tested-by: NVladimir Zapolskiy <vz@mleia.com>