ARM: dts: a20-m5: Enable AHCI

Enable ahci node for sun7i-a20-m5.dts, this would require since
we have DM_SCSI enabled on the respective SoC.

No need to send patch to Linux for this change, since this
dts is U-Boot specific.

Cc: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/arch/arm/dts/sun7i-a20-m5.dts b/arch/arm/dts/sun7i-a20-m5.dts
index 65930cc..6de52c7 100644
--- a/arch/arm/dts/sun7i-a20-m5.dts
+++ b/arch/arm/dts/sun7i-a20-m5.dts
@@ -21,6 +21,10 @@
 	};
 };
 
+&ahci {
+	status = "okay";
+};
+
 &ehci0 {
 	status = "okay";
 };