mb/google/deltaur: Move selects from Kconfig.name to Kconfig

Move selects from Kconfig.name to Kconfig so that the configuration is
at one place and not distributed over two files.

Change-Id: I9b523ebee2d2af8585736588306ca687dfe16003
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60366
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/mainboard/google/deltaur/Kconfig

@@ -19,6 +19,12 @@ config BOARD_GOOGLE_BASEBOARD_DELTAUR
 	select SOC_INTEL_TIGERLAKE
 	select SYSTEM_TYPE_LAPTOP
 
+config BOARD_GOOGLE_DELTAN
+	select BOARD_GOOGLE_BASEBOARD_DELTAUR
+
+config BOARD_GOOGLE_DELTAUR
+	select BOARD_GOOGLE_BASEBOARD_DELTAUR
+
 if BOARD_GOOGLE_BASEBOARD_DELTAUR
 
 config CHROMEOS

src/mainboard/google/deltaur/Kconfig.name

@@ -2,8 +2,6 @@ comment "Deltaur"
 
 config BOARD_GOOGLE_DELTAN
 	bool "->  Deltan"
-	select BOARD_GOOGLE_BASEBOARD_DELTAUR
 
 config BOARD_GOOGLE_DELTAUR
 	bool "->  Deltaur"
-	select BOARD_GOOGLE_BASEBOARD_DELTAUR