sunxi: dts: Add minimal dts files for board which lack a dts sofar

u-boot has support for a number of boards for which a dts file still needs
to be written, add minimal dts files for these boards so that we can switch
them over to driver-model / fdt.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/sun6i-a31s-primo81.dts b/arch/arm/dts/sun6i-a31s-primo81.dts
new file mode 100644
index 0000000..cfdc03e
--- /dev/null
+++ b/arch/arm/dts/sun6i-a31s-primo81.dts
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2015 Hans de Goede <hdegoede@redhat.com>
+ *
+ * Minimal dts file for the MSI Primo81 for u-boot only
+ *
+ * SPDX-License-Identifier:     GPL-2.0+ or X11
+ */
+
+/dts-v1/;
+#include "sun6i-a31s.dtsi"
+
+/ {
+	model = "MSI Primo81";
+	compatible = "msi,primo81", "allwinner,sun6i-a31s";
+
+	aliases {
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+};
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pins_a>;
+	status = "okay";
+};