r8169: use new PM macros

This is based on series [0] that extended the PM core. Now the compiler
can see the PM callbacks also on systems not defining CONFIG_PM.
The optimizer will remove the functions then in this case.

[0] https://lore.kernel.org/netdev/20211207002102.26414-1-paul@crapouillou.net/

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>