[PATCH] ARM: OMAP: DMA updates to OMAP MMC driver

DMA updates to the OMAP MMC driver (Juha):

	* Accept multi-segment scatterlist requests to reduce the cost
	  of data transfer operations, increasing speed dramatically
	* Release DMA channel lazily for a minor performance boost
	* Synchronize the completion of a request to both DMA transfer
	  completion and command completion to work around a problem of
	  some response IRQs being lost

Also, updates from DB for handling the individual DMA segments:

	* Use the correct sg_dma_*() calls;
	* Return to the previous scheme of doing DMA in frames of up
	  no more than one FIFO's worth of data, and
	* Don't print messages in the curious "DMA IRQ with DMA still
	  pending" case.

This provides about a 10% improvement in elapsed time during large DMA
transfers, 100% improvement in kernel time, and orders of magnitude
reduction in IRQ count.
Signed-off-by: Juha Yrjölä <juha.yrjola@nokia.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>