r8169: merge with version 6.001.00 of Realtek's r8169 driver

- new identifier for the 8110SCe

- the PCI latency timer is set unconditionally. This part is identical
  in Realtek's r8168 (8.001.00) and r8101 (1.001.00)

- initialization of the cache line size register is for the 8169s only

- more magic in rtl_hw_start_8169

- it is not possible to factor out the setting of the the irq event mask
  with the 8168 and the 8101 any more. Pushed it into the hw_start handler.

- rtl_set_rx_tx_config_registers() and write to the ChipCmd register are
  issued identically for the whole 8169/8110 family: the 8110SCd/8110SCe
  are handled the same way

- work around for AMD platform.

Some registers definitions in Realtek's driver are let aside for later.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Edward Hsu <edward_hsu@realtek.com.tw>