[riot-notifications] [RIOT-OS/RIOT] [RFC][WIP] Initial implementation of a more layered approach to netdev (#8198)

Kaspar Schleiser notifications at github.com
Sat Dec 9 13:10:23 CET 2017

> Every layer must implement all ops, that's why I've build a few NULL-like ops.

This brings back an idea I've had for a while: how about refactoring ```netdev_t``` to have all function pointers in it's own structure (netdev_ops_t), which would be the first member of netdev_t?
If we also add a "parent" pointer, we could have a couple of pre-made functions that just pass on to the parent, e.g.,

netdev_send_t netdev_send_nop(netdev_t *dev, ...)
   return dev->parent->ops->send(dev->parent, ...)
The benefits of an extra ```ops``` field would be that every layer would only have a base RAM usage of two pointers (ops and parent) in addition to any state, with the ```ops``` struct being in ROM.

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