ARM: S3C64XX: Use clk_prepare_enable/clk_disable_unprepare in dma.c

This patch modifies s3c64xx DMA driver to prepare and unprepare clocks
in addition to enableind and disabling, since it is required by common
clock framework.

Signed-off-by: Tomasz Figa <[e-mail]>
Tested-by: Mark Brown <[e-mail]>
Signed-off-by: Kukjin Kim <[e-mail]>

arch/arm/mach-s3c64xx/dma.c

···
 		goto err_map;
 	}
 
-	clk_enable(dmac->clk);
+	clk_prepare_enable(dmac->clk);
 
 	dmac->regs = regs;
 	dmac->chanbase = chbase;
···
 	return 0;
 
 err_clk:
-	clk_disable(dmac->clk);
+	clk_disable_unprepare(dmac->clk);
 	clk_put(dmac->clk);
 err_map:
 	iounmap(regs);