board: sunxi: Add R40 sata compatible

Add sata compatible for R40.

Cc: Pablo Sebastián Greco <pgreco@centosproject.org>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/board/sunxi/ahci.c b/board/sunxi/ahci.c
index a79b80c..9b03013 100644
--- a/board/sunxi/ahci.c
+++ b/board/sunxi/ahci.c
@@ -121,6 +121,7 @@
 
 static const struct udevice_id sunxi_ahci_ids[] = {
 	{ .compatible = "allwinner,sun4i-a10-ahci" },
+	{ .compatible = "allwinner,sun8i-r40-ahci" },
 	{ }
 };