mb/clevo/cml-u/l140cu: Extend Kconfig option text with L141CU

Extend the Kconfig option text of L140CU with L141CU since the hardware
of both is equal.

Change-Id: If0e5061fc345208688a678a4cdf7c5ecaf47c17d
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47716
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

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

@@ -1,4 +1,4 @@
 comment "Comet Lake U"
 
 config BOARD_CLEVO_L140CU
-	bool "L140CU"
+	bool "L140CU / L141CU"