ZD1211 hardware encryption/decryption

ZD1211 implements a CAM (Content Addressable Memory) interface for encryption and decryption in hardware. Actually, the implementation is not quite a CAM, it is more of a specialised search engine.

Many thanks to ZyDAS for providing some basic documentation about this component and allowing us to publish it.

This is a static dump of the old wiki, taken after locking it in January 2015. The new wiki is at https://wireless.wiki.kernel.org/.
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