Remove the use of a tasklet to start the DMA channel when issue_pending is
called.
The use of tasklet delays the DMA start which can cause issues at drivers,
for example the audio drivers expect that the DMA is started right away.

Signed-off-by: Peter Ujfalusi <redacted>

I've reported the problem and now tested the patch applied on top of 
3.8.5, running on beagle-xm; sounds good, so

Tested-by: Peter Meerwald <redacted>

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Peter Meerwald
+43-664-2444418 (mobile)