netdev: netdevice devmem allocator

Implement netdev devmem allocator. The allocator takes a given struct
netdev_dmabuf_binding as input and allocates net_iov from that
binding.

The allocation simply delegates to the binding's genpool for the
allocation logic and wraps the returned memory region in a net_iov
struct.

Signed-off-by: Willem de Bruijn <[email protected]>
Signed-off-by: Kaiyuan Zhang <[email protected]>
Signed-off-by: Mina Almasry <[email protected]>
Reviewed-by: Pavel Begunkov <[email protected]>
Reviewed-by: Jakub Kicinski <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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