sun6i: Enable SPL

Enable the SPL now that we've all the necessary bits in place.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index 5b2d091..6688386 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -16,6 +16,7 @@
 config MACH_SUN6I
 	bool "sun6i (Allwinner A31)"
 	select CPU_V7
+	select SUPPORT_SPL
 
 config MACH_SUN7I
 	bool "sun7i (Allwinner A20)"