qede: get_channels() need to populate max tx/rx coalesce values

qede: get_channels() need to populate max tx/rx coalesce values

Orabug: 25477939

Recent changes in kernel ethtool implementation requires the driver
callback for get_channels() has to populate the values for max tx/rx
coalesce fields.

Signed-off-by: Sudarsana Reddy Kalluru <Sudarsana.Kalluru@cavium.com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit bdc8cbd34d5d9d82c3db4df6a182b0530040062d)
Signed-off-by: Brian Maly <brian.maly@oracle.com>