device/Kconfig: Introduce MAINBOARD_FORCE_NATIVE_VGA_INIT

MAINBOARD_FORCE_NATIVE_VGA_INIT is to be selected instead of the user
option MAINBOARD_DO_NATIVE_VGA_INIT. The distinction is necessary to
use the latter in a choice.

Change-Id: I689aa5cadea9e1091180fd38b1dc093c6938d69c
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/19813
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/mainboard/emulation/qemu-i440fx/Kconfig

@@ -11,7 +11,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select HAVE_ACPI_TABLES
 	select BOARD_ROMSIZE_KB_256
 	select MAINBOARD_HAS_NATIVE_VGA_INIT
-	select MAINBOARD_DO_NATIVE_VGA_INIT
+	select MAINBOARD_FORCE_NATIVE_VGA_INIT
 
 config MAINBOARD_DIR
 	string