net: gianfar: convert to hw_features

Note: I bet that gfar_set_features() don't really need a full reset.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/gianfar.c
Simple merge

diff --cc drivers/net/gianfar.h
Simple merge

diff --cc drivers/net/gianfar_ethtool.c
Simple merge