[PATCH] OMAP audio DMA changes for 310 CPUs

Avoid restarting McBSP hardware after every DMA transfer to OMAP audio
devices on OMAP310, restart only DMA. Also avoid trying to link DMA
channels together as this feature isn't supported on 310 processors.
Apply on top of "[PATCH 1/5] Change all omap15xx devices to use
similar DMA handling than h6300 uses".

Signed-off-by: Andrzej Zaborowski <balrog@zabor.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>