Documentation: dt-bindings: minimal documentation for MVEBU SDRAM controller

The suspend/resume code for Armada XP has to modify certain registers
of the SDRAM controller. Therefore, we need to define a Device Tree
binding for this hardware block.

Signed-off-by: Thomas Petazzoni <[email protected]>
Cc: [email protected]
Cc: Kumar Gala <[email protected]>
Cc: Ian Campbell <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Rob Herring <[email protected]>
Reviewed-by: Gregory CLEMENT <[email protected]>
Link: https://lkml.kernel.org/r/1416585613-2113-2-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <[email protected]>

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