dmaengine: s3c24xx-dma: add support for the s3c2410 type of controller

The earliest variants of the dma controller did not contain support for
controlling clocks.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>