ARM: dts: keystone-k2e-evm: Add U-boot specific dtsi file

With Davinci I2C switching to device model, K2E requires U-boot specific
device tree entries. This is only required for I2C 1 which is needed
extremely early during the boot process.

Fixes: 1743d040 ("ARM: keystone: Enable DM_I2C by default")
Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>

arch/arm/dts/keystone-k2e-evm-u-boot.dtsi

+/*
+ * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/{
+	soc {
+		u-boot,dm-pre-reloc;
+	};
+};
+
+&i2c1 {
+	u-boot,dm-pre-reloc;
+};