net/i40e: fix link status change interrupt

net/i40e: fix link status change interrupt

Previously, link status interrupt in i40e is achieved by checking
LINK_STAT_CHANGE_MASK in PFINT_ICR0 register which is provided only
for diagnostic use. Instead, drivers need to get the link status
change notification by using LSE (Link Status Event).

This patch enables LSE and calls LSC callback when the event is
received. This patch also removes the processing on
LINK_STAT_CHANGE_MASK.

Fixes: 4861cde46116 ("i40e: new poll mode driver")

Signed-off-by: Qiming Yang <qiming.yang@intel.com>
Acked-by: Jingjing Wu <jingjing.wu@intel.com>