ixgbe: Correct Adaptive Interrupt Moderation so that it will change values

ixgbe: Correct Adaptive Interrupt Moderation so that it will change values

This change corrects an issue in which Adaptive Interrupt Moderation was
not changing values due to the fact that we were performing an and
operation on the resultant value that was causing the value to never change
from the default 20K interrupts per second.

(cherry picked from commit 5d967eb7f84d2761d624d033c2583187b37b56ce)
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Joe Jin <joe.jin@oracle.com>