ARM: orion5x: rename XOR node to dma-controller@<address>

ARM: orion5x: rename XOR node to dma-controller@<address>

This commit renames the XOR engine Device Tree node to
dma-controller@, to conform with the standard node name proposed by
the ePAPR.

Suggested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Link: https://lkml.kernel.org/r/1398202002-28530-19-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>