Update drawing and remove description of old features.
Add HSI and USB link layers to the drawing.
Reported-by: NJoerg Reisenweber <joerg.reisenweber@stericssion.com>
Signed-off-by: NSjur Brændeland <sjur.brandeland@stericssion.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>