e1000e: fix unit hang during loopback test

e1000e: fix unit hang during loopback test

Orabug: 21792108

System would hang during execution of "ethtool -t <NIC>" for the same
reason that required flushing the descriptor rings. This fix disables
MULR for the loopback test to avoid the hang state.

Signed-off-by: Yanir Lubetkin <yanirx.lubetkin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit 2ec7d2974c5665780e5f2b532833b76531f0a8d3)
Signed-off-by: Brian Maly <brian.maly@oracle.com>