arm64: dts: uniphier: Enable spi node for PXs3 reference board

PXs3 reference board has 2 spi connectors. This enables spi0 and spi1,
and adds aliases properties for each spi to determine device name
assignments.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm64/boot/dts/socionext/uniphier-pxs3-ref.dts

@@ -27,6 +27,8 @@ aliases {
 		i2c2 = &i2c2;
 		i2c3 = &i2c3;
 		i2c6 = &i2c6;
+		spi0 = &spi0;
+		spi1 = &spi1;
 	};
 
 	memory@80000000 {
@@ -39,6 +41,14 @@ &ethsc {
 	interrupts = <4 8>;
 };
 
+&spi0 {
+	status = "okay";
+};
+
+&spi1 {
+	status = "okay";
+};
+
 &serial0 {
 	status = "okay";
 };