mb/*/Kconfig: Drop redundant 'select CONSOLE_SERIAL'

'CONSOLE_SERIAL' is already set to 'y' at src/console/Kconfig.

Change-Id: I350cf12a115c6ebe54a2b0821edc94c29db8d137
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44906
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/mainboard/intel/saddlebrook/Kconfig

@@ -5,7 +5,6 @@ if BOARD_INTEL_SKLSDLBRK
 config BOARD_SPECIFIC_OPTIONS
 	def_bool y
 	select BOARD_ROMSIZE_KB_4096
-	select CONSOLE_SERIAL
 	select DRIVERS_UART
 	select GENERIC_SPD_BIN
 	select HAVE_ACPI_RESUME