e1000e: don't clean Rx ring while resetting

When using legacy interrupts, do not clean the Rx ring while resetting
otherwise traffic will not pass.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>