r8169: phy init for the 8169scd

Synced with Realtek's 6.011.00 r8169 driver.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Edward Hsu <edward_hsu@realtek.com.tw>
Signed-off-by: David S. Miller <davem@davemloft.net>