siemens/sitemp_g1p1: Fix serial output for simo board

The simo board with console output at UART port 1 (COM2) will not produce
any output if CONFIG_UART_FOR_CONSOLE=1 is set correctly.
Commit f29200240e428761827ab8d179fa23068bfa9d59
(superio/ite/*: Factor out generic romstage component)
will only and always activate UART port 0 unregarded to
CONFIG_UART_FOR_CONSOLE value.
Now the UART port which was selected by CONFIG_UART_FOR_CONSOLE
will be enabled and used for console output

Change-Id: Ibbd2b5115b1ed4763962ba32fc9c19431a906c78
Signed-off-by: Dennis Wassenberg <dennis.wassenberg@secunet.com>
Reviewed-on: http://review.coreboot.org/7060
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>