ARM: dts: am43xx: Add u-boot specific dtsi

Add u-boot specific dtsi for am43xx-gp-evm so
that it will be used for SPL.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

arch/arm/dts/am437x-gp-evm-u-boot.dtsi

+/*
+ * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ * Based on "dra7.dtsi"
+ */
+
+/{
+	ocp {
+		u-boot,dm-pre-reloc;
+	};
+};
+
+&uart0 {
+	u-boot,dm-pre-reloc;
+};
+
+&mmc1 {
+	u-boot,dm-pre-reloc;
+};
+
+&mac {
+	u-boot,dm-pre-reloc;
+};
+
+&davinci_mdio {
+	u-boot,dm-pre-reloc;
+};
+
+&cpsw_emac0 {
+	u-boot,dm-pre-reloc;
+};
+
+&phy_sel {
+	u-boot,dm-pre-reloc;
+};