Revert "Revamped the PHY code for the 82571 controller"

This reverts commit 83e723eb091b391d248b9129b0c27e9b3f14f610. I forget
to commit the rest of the changes. Will do that in next commit.
Revamped the PHY code for the 82571 controller

1. Added locking and unlocking between software/hardware on PHY access
2. Modified PHY locking code for 82571 (differs from 82574)
3. Modified the PHY reset code for 82571 (differs from 82574)