ARM: dts: aspeed: ast2600evb: Enable FSI master

Use the first FSI master.
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-ast2600-evb.dts

@@ -213,3 +213,7 @@ &i2c14 {
 &i2c15 {
 	status = "okay";
 };
+
+&fsim0 {
+	status = "okay";
+};