rapidio/tsi721_dma: advance queue processing from transfer submit call

rapidio/tsi721_dma: advance queue processing from transfer submit call

Add advancing transfer queue immediately from transfer submit call.  DMA
performance improvement: This will start transfer without waiting for
'issue_pending' command if there is no DMA transfer in progress.

Link: http://lkml.kernel.org/r/1469125134-16523-8-git-send-email-alexandre.bounine@idt.com
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Cc: Barry Wood <barry.wood@idt.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>