mb/siemens/mc_ehl: Move UART_FOR_CONSOLE switch to variant level

There are currently two variants for mc_ehl where different UARTs are
used for the console. Move the Kconfig switch UART_FOR_CONSOLE to the
Kconfig of the variant and select the matching value there.

Change-Id: I7152013a0e32ff151b92932a47953705e591dc0d
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58052
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/siemens/mc_ehl/Kconfig

@@ -34,9 +34,4 @@ config DEVICETREE
 config DIMM_SPD_SIZE
 	default 512
 
-config UART_FOR_CONSOLE
-	int
-	default 2 if INTEL_LPSS_UART_FOR_CONSOLE
-	default 0
-
 endif # BOARD_SIEMENS_BASEBOARD_MC_EHL

src/mainboard/siemens/mc_ehl/variants/mc_ehl1/Kconfig

@@ -8,4 +8,8 @@ config BOARD_SPECIFIC_OPTIONS
 config FMDFILE
 	default "src/mainboard/\$(CONFIG_MAINBOARD_DIR)/mc_ehl.fmd"
 
+config UART_FOR_CONSOLE
+	int
+	default 2
+
 endif # BOARD_SIEMENS_MC_EHL1

src/mainboard/siemens/mc_ehl/variants/mc_ehl2/Kconfig

@@ -8,4 +8,8 @@ config BOARD_SPECIFIC_OPTIONS
 config FMDFILE
 	default "src/mainboard/\$(CONFIG_MAINBOARD_DIR)/mc_ehl.fmd"
 
+config UART_FOR_CONSOLE
+	int
+	default 0
+
 endif # BOARD_SIEMENS_MC_EHL2