ARM: dts: Add new "generic" am4372 device tree file.

With U-boot runtime board detect for DTB selection a "default" dtb needs
to be created. This will be used temporarily until the "proper" dtb is
selected.

Also, add -u-boot.dtsi for AM437x SK and IDK to enable I2C for
board detection via DM_I2C.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/arch/arm/dts/am4372-generic.dts b/arch/arm/dts/am4372-generic.dts
new file mode 100644
index 0000000..0c48439
--- /dev/null
+++ b/arch/arm/dts/am4372-generic.dts
@@ -0,0 +1,24 @@
+/*
+ * Device Tree Source for Generic AM4372 EVM
+ *
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/dts-v1/;
+
+#include "am4372.dtsi"
+
+/ {
+	compatible = "ti,am4372", "ti,am43";
+	model = "Texas Instruments AM4372 Generic";
+
+	chosen {
+		stdout-path = &uart0;
+	};
+};
+
+&i2c0 {
+	status = "okay";
+};