pch_dma: fix DMA issue(ch8-ch11)

ISSUE: In case PCH_DMA with I2S communications with ch8~ch11, sometimes I2S data
is not send correctly.
CAUSE: The following patch I submitted before was not enough modification for
supporting DMA ch8~ch11. The modification for status register of ch8~11 was not
enough.

pch_dma: Support I2S for ML7213 IOH
author	Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
	Mon, 9 May 2011 07:09:38 +0000 (16:09 +0900)
committer	Vinod Koul <vinod.koul@intel.com>
	Mon, 9 May 2011 11:42:23 +0000 (16:42 +0530)
commit	194f5f27
tree	c9d4903ea02b18939a4f390956a48be1a3734517
parent	60092d0b

This patch fixes the issue.
We can confirm PCH_DMA with I2S communications with ch8~ch11 works well.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>