DMA clients pdma0 and pdma1 are internal to the SoC and are used only
by dedicated peripherals. Since they cannot be used for generic
purpose, their capability should be set as DMA_PRIVATE.

CC: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: NTushar Behera <tushar.behera@linaro.org>
Acked-by: NKukjin Kim <kgene.kim@samsung.com>
Signed-off-by: NVinod Koul <vinod.koul@linux.intel.com>