mainboard/*: Use generic winbond romstage in place of w83627thg

Use the generic implementation of winbond in place of the model specific
w83627thg_enable_serial() as so that it maybe removed later.

Change-Id: Ice1a0dc428de9a3ddfb79e877fb03c7a8e09665f
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5603
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
3 files changed