The RaidEngine is a new Freescale hardware that used for parity
computation offloading in RAID5/6.

This patch adds the device node in device tree and related binding
documentation.
Signed-off-by: NHarninder Rai <harninder.rai@freescale.com>
Signed-off-by: NNaveen Burmi <naveenburmi@freescale.com>
Signed-off-by: NXuelin Shi <b29237@freescale.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>