r8169: switch to device-managed functions in probe (part 2)

This is a follow up to the commit

  4c45d24a ("r8169: switch to device-managed functions in probe")

to move towards managed resources even more.

Cc: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>