superio/winbond/w83627thg: Remove w83627thg_enable_serial symbol

Remove model specific implementation, w83627thg_enable_serial, from
romstage component of sio support.

Change-Id: I8ef1de5ccccae5f4dba69dbdb939e7070d3cecfc
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5604
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
2 files changed