tg3: Match power source to driver state

Now that the driver state (and power source) is being more intensely
scrutinized, we need to make sure it is correct 100% of the time.  This
patch finds and fixes all dangling power state transitions.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>