Added support for DMA chaining.
This patch depends on patches [1-3]
"OMAP: DMA: Cleanup of DMA Request Lines",
"OMAP: DMA: Added support for OMAP3" and
"OMAP: DMA: Added utility APIs for setting DMA global parameters".
Signed-off-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>