sunxi: Depend SPL configs on SUPPORT_SPL

We currently depend SPL config options on specific machine types which doesn't
scale. Fortunately there's already a kconfig variable that tells us whether we
want to build SPL code at all, so just depend them on this.

Signed-off-by: Alexander Graf <agraf@suse.de>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

arch/arm/Kconfig

@@ -538,8 +538,8 @@ config ARCH_SUNXI
 	select OF_BOARD_SETUP
 	select OF_CONTROL
 	select OF_SEPARATE
-	select SPL_STACK_R if !MACH_SUN9I
-	select SPL_SYS_MALLOC_SIMPLE if !MACH_SUN9I
+	select SPL_STACK_R if SUPPORT_SPL
+	select SPL_SYS_MALLOC_SIMPLE if SUPPORT_SPL
 	select SYS_NS16550
 	select USB
 	select USB_STORAGE