sunxi: Select USE_TINY_PRINTF

This gives us a bit more breathing room wrt our SPL size.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/Kconfig

@@ -637,6 +637,7 @@ config ARCH_SUNXI
 	select USB
 	select USB_STORAGE
 	select USB_KEYBOARD
+	select USE_TINY_PRINTF
 
 config TARGET_TS4800
 	bool "Support TS4800"