i40e: negate PHY int mask bits

i40e: negate PHY int mask bits

BugLink: http://bugs.launchpad.net/bugs/1547674
The PHY interrupt mask bits mask out the events we don't want,
so we need to negate the bitmask of events we want.

Change-ID: I273244da5a8d285b6abc84fd68a90f1e6fa0393e
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from net-next commit 2f0aff4151e13fff669b1fab4b93b7613b3b4be5)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>