siemens/mc_apl4: Change UART_FOR_CONSOLE index

This mainboard uses SOC internal UART 1 instead of UART 2 like all other
mc_apl1 mainboards.

Change-Id: Ib986962ed068fee019ffcec0391d43d5ab178458
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/30933
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/siemens/mc_apl1/variants/mc_apl4/Kconfig

@@ -7,4 +7,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select APL_SET_MIN_CLOCK_RATIO
 	select DRIVERS_I2C_RX6110SA
 
+config UART_FOR_CONSOLE
+	default 1
+
 endif # BOARD_SIEMENS_MC_APL4