mb/clevo/kbl-u: Rework Kconfig

Rework Kconfig file so that each variant has its own config option with
their specific selects / configuration and move common selects to a
seperate config option, which is used as base for each variant.

Built clevo/n130wu with BUILD_TIMELESS=1, coreboot.rom remains the same.

Change-Id: I1f07b5851ece6d0943faa9c90fc518805880a27d
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49060
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-by: Daniel Maslowski <info@orangecms.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/clevo/kbl-u/Kconfig

@@ -1,9 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
-if BOARD_CLEVO_N130WU
-
-config BOARD_SPECIFIC_OPTIONS
-	def_bool y
+config BOARD_CLEVO_KBLU_COMMON
+	def_bool n
 	select BOARD_ROMSIZE_KB_8192
 	select EC_ACPI
 	select HAVE_ACPI_RESUME
@@ -21,6 +19,12 @@ config BOARD_SPECIFIC_OPTIONS
 	select SPD_READ_BY_WORD
 	select SYSTEM_TYPE_LAPTOP
 
+config BOARD_CLEVO_N130WU_OPTIONS
+	bool
+	select BOARD_CLEVO_KBLU_COMMON
+
+if BOARD_CLEVO_KBLU_COMMON
+
 config VBOOT
 	select VBOOT_NO_BOARD_SUPPORT
 	select GBB_FLAG_DISABLE_LID_SHUTDOWN

src/mainboard/clevo/kbl-u/Kconfig.name

@@ -4,3 +4,4 @@ comment "Kaby Lake U"
 
 config BOARD_CLEVO_N130WU
 	bool "N130WU / N131WU"
+	select BOARD_CLEVO_N130WU_OPTIONS