x86: dts: Add a device tree file for EFI

This contains just enough to bring up the serial UART.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/dts/Makefile

@@ -2,6 +2,7 @@ dtb-y += bayleybay.dtb \
 	chromebook_link.dtb \
 	chromebox_panther.dtb \
 	crownbay.dtb \
+	efi.dtb \
 	galileo.dtb \
 	minnowmax.dtb \
 	qemu-x86_i440fx.dtb \

arch/x86/dts/efi.dts

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/dts-v1/;
+
+/include/ "skeleton.dtsi"
+
+/ {
+	model = "EFI";
+	compatible = "efi,app";
+
+	chosen {
+		stdout-path = &serial;
+	};
+
+	serial: serial {
+		compatible = "efi,uart";
+	};
+};