r8169: remove the firmware of RTL8111D.

The binary file of the firmware is moved to linux-firmware repository.
The firmwares are rtl_nic/rtl8168d-1.fw and rtl_nic/rtl8168d-2.fw.
The driver goes along if the firmware couldn't be found. However, it
is suggested to be done with the suitable firmware.

Some wrong PHY parameters are directly corrected in the driver.

Simple firmware checking added per Ben Hutchings suggestion.
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Ben Hutchings <benh@debian.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/Kconfig

@@ -2233,6 +2233,7 @@ config YELLOWFIN
 config R8169
 	tristate "Realtek 8169 gigabit ethernet support"
 	depends on PCI
+	select FW_LOADER
 	select CRC32
 	select MII
 	---help---