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Add set_output/unset_output ops for overlay managers, these form links between managers and outputs. Create a function in dss features which tell all the output instances that connect to a manager, use it when a manager tries to set an output. Add a constraint of not unsetting an output when the manager is enabled. Keep the omap_dss_device pointer and set/unset_device ops in overlay_manager for now to not break things. Keep the dss feature function get_supported_displays as it's used in some places. These will be removed later. Signed-off-by: Archit Taneja <archit@ti.com>