mainboard/tyan/s8226: Remove redundant sio header

Change-Id: I8d258c12d03e71fb525251104b4fa81596ad2187
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5599
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
superio/winbond/w83627ehg: Convert romstage to generic component

Convert the serial init to the generic romstage component and
corresponding boards using this sio.

Change-Id: Ib9f981f43e047013f9cbe20a22246ee2ed3ecf50
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5589
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>