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LPA_IF dma channel is disabled without checking the per count value.
Because of this dma channel is not functional after few iterations
of continuous playback. Fix this issue by checking the dma per count
value to stop before disabling the LPA_IF dma channel.

Change-Id: Ie9e9a9337ca2c4b76cebd99cd3eb98137be85b89
Signed-off-by: Deepa Madiregama <dmadireg@codeaurora.org>