ARM: dts: at91: Add dts files for at91sam9260ek/9g20ek

The device tree source files of at91sam9g20ek and at91sam9260ek
boards are copied from the Linux v4.10, do the changes below.
 - Fix the build error for the usb0 node.
 - Add the reg property for the pinctrl node.
 - Move the gpio (pioA, pioB, pioC ...) nodes as the pinctrl's
   slibling nodes, instead of the child nodes.
 - Add the "u-boot,dm-pre-reloc" property for the dbgu node are used
   in board_init_f stage.
 - Add the clk pinctrl of the mmc0 node.
 - Fix the compilation warnings.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/at91sam9g20ek.dts b/arch/arm/dts/at91sam9g20ek.dts
new file mode 100644
index 0000000..bbfd753
--- /dev/null
+++ b/arch/arm/dts/at91sam9g20ek.dts
@@ -0,0 +1,29 @@
+/*
+ * at91sam9g20ek.dts - Device Tree file for Atmel at91sam9g20ek board
+ *
+ * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * Licensed under GPLv2.
+ */
+/dts-v1/;
+#include "at91sam9g20ek_common.dtsi"
+
+/ {
+	model = "Atmel at91sam9g20ek";
+	compatible = "atmel,at91sam9g20ek", "atmel,at91sam9g20", "atmel,at91sam9";
+
+	leds {
+		compatible = "gpio-leds";
+
+		ds1 {
+			label = "ds1";
+			gpios = <&pioA 9 GPIO_ACTIVE_HIGH>;
+			linux,default-trigger = "heartbeat";
+		};
+
+		ds5 {
+			label = "ds5";
+			gpios = <&pioA 6 GPIO_ACTIVE_LOW>;
+		};
+	};
+};