arch/x86: Enable POSTCAR_CONSOLE by default

Almost all platforms force it on. Make it enabled by
default but under user control to optionally disable it.

Change-Id: I6b0f19c8bfd6ffed93023d57a1d28ca6acc06835
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34803
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Martin Roth <martinroth@google.com>

src/mainboard/emulation/qemu-i440fx/Kconfig

@@ -13,7 +13,6 @@ config BOARD_SPECIFIC_OPTIONS
 	select MAINBOARD_HAS_NATIVE_VGA_INIT
 	select MAINBOARD_FORCE_NATIVE_VGA_INIT
 	select POSTCAR_STAGE
-	select POSTCAR_CONSOLE
 
 config MAINBOARD_DIR
 	string