Create a helper to retrieve dwmac private data from a dev
pointer. This is useful in PM callbacks and driver remove.
Signed-off-by: NJoachim Eastwood <manabian@gmail.com>
Tested-by: NMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NKevin Hilman <khilman@baylibre.com>