drivers/net: get rid of unnecessary initializations in .get_drvinfo()

drivers/net: get rid of unnecessary initializations in .get_drvinfo()

Many drivers initialize uselessly n_priv_flags, n_stats, testinfo_len,
eedump_len & regdump_len fields in their .get_drvinfo() ethtool op.
It's not necessary as these fields is filled in ethtool_get_drvinfo().

v2: removed unused variable
v3: removed another unused variable

Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Suresh Reddy <suresh.reddy@avagotech.com>
Signed-off-by: Suresh Reddy <suresh.reddy@broadcom.com>
Orabug: 22725582
Signed-off-by: Manjunath Govindashetty <manjunath.govindashetty@oracle.com>