With the 'struct dma_pl330_peri' removed, the platfrom data for dma
driver can be simplified to a simple list of peripheral request ids.

Cc: Jassi Brar <jassisinghbrar@gmail.com>
Acked-by: Boojin Kim <boojin.kim@samsung.com>
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>