r8169: wake up the PHY of the 8168

Upstream as a2de6b89b74b28052e293fdb39975a5a03c432e0

This is typically needed when some other OS puts the PHY
to sleep due to the disabling of WOL options in the BIOS
of the system.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Tested-by: Chiaki Ishikawa <chiaki.ishikawa@ubin.jp>
Cc: Edward Hsu <edward_hsu@realtek.com.tw>
Cc: RyanKao <ryankao@realtek.com.tw>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>