sunxi: Add default zq value for sun9i (A80)

Both the A80 Optimus board and the Cubieboard 4 use a zq value of
4145117, or 0x3f3fdd.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

board/sunxi/Kconfig

@@ -163,6 +163,7 @@ config DRAM_ZQ
 	int "sunxi dram zq value"
 	default 123 if MACH_SUN4I || MACH_SUN5I || MACH_SUN6I || MACH_SUN8I
 	default 127 if MACH_SUN7I
+	default 4145117 if MACH_SUN9I
 	---help---
 	Set the dram zq value.