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The s3c2412 dma init contained code to handle dma-direction specific
settings. As now all s3c2412-dma-channels are direction-independent this
is not needed anymore.

As the s3c2412 also was the only user of this, it can go away completely.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>