superio/common/conf_mode.c: Introduce 'new' enter/exit keys for SIO's

Super I/O manufactures have found new and innovative ways to enter
and exit out of LDN config in PNP config space.

Change-Id: Id3f5882664f1b2b18b49f32373430cf4b037ad22
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7308
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Bruce Griffith <Bruce.Griffith@se-eng.com>
superio/fintek/f81216h: Implement device support

Change-Id: I20a34b569f109dd12af29e9e0cee8f7f6b8ebb80
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7309
Tested-by: build bot (Jenkins)
Reviewed-by: Bruce Griffith <Bruce.Griffith@se-eng.com>