mb/siemens/mc_ehl2: Enable LPC ComB

Enable LPC ComB on this mainboard.

TEST:
- Boot Linux and check with 'dmesg | grep tty'

Change-Id: I7ec58685a723c177df18144011934b206e6425d0
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58170
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>

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

@@ -3,6 +3,7 @@ if BOARD_SIEMENS_MC_EHL2
 config BOARD_SPECIFIC_OPTIONS
 	def_bool y
 	select DRIVER_INTEL_I210
+	select SOC_INTEL_COMMON_BLOCK_LPC_COMB_ENABLE
 
 config FMDFILE
 	default "src/mainboard/\$(CONFIG_MAINBOARD_DIR)/mc_ehl.fmd"