ARM: shmobile: marzen: enable HSPI0 in DTS

Based on work for the bockw board by Kuninori Morimoto.

Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7779-marzen-reference.dts

@@ -97,6 +97,11 @@
 		renesas,groups = "sdhi0_data4", "sdhi0_ctrl", "sdhi0_cd";
 		renesas,function = "sdhi0";
 	};
+
+	hspi0_pins: hspi0 {
+		renesas,groups = "hspi0";
+		renesas,function = "hspi0";
+	};
 };
 
 &sdhi0 {
@@ -107,3 +112,9 @@
 	bus-width = <4>;
 	status = "okay";
 };
+
+&hspi0 {
+	pinctrl-0 = <&hspi0_pins>;
+	pinctrl-names = "default";
+	status = "okay";
+};