igb: update the approach taken to acquiring and releasing the phy lock
The current approach is just using a ?: type mechanism to set the phy
locking bit. This if fine for now but limits us to only 2. Switch to a
nested if statement for future compatiblity with more than 2 phys.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>