Add ethtool statistics support

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Add ethtool register dump support

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Fix TX ring state in DebugFS

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Rename tx queue to ring because of confusion

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>