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Sometimes, it is desired to create 1:n and n:1 or even n:n links between different entities with the same function. This is actually needed to support DVB devices that have multiple frontends. While we could do a function like that internally at the DVB core, such function is generic enough to be at media-entity, and it could be useful on some other places. So, add such function. Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>