linux-imx

MLK-15003-2: Document: fsl_edma_v3: update document

update fsl_edma_v3 document for #dma-cell is changed
one more cell is added, which is for local/remote access.

Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>
(cherry picked from commit 65543fb7fefbdb7df4cb60931a88f61507c5073f)