arm: Add Khadas VIM support based on Meson GXL family

This adds platform code for the Khadas VIM board based on a
Meson GXL (S905X) SoC with the Meson GXL configuration.

This initial submission supports UART, MMC/SDCard and Ethernet with the
Internal RMII PHY.

The meson-gxl-s905x-khadas-vim.dts is synchronised from the linux 4.13
stable tree as of 4.13.8.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

include/configs/khadas-vim.h

@@ -0,0 +1,21 @@
+/*
+ * Configuration for Khadas VIM
+ *
+ * Copyright (C) 2017 Baylibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+#define CONFIG_MISC_INIT_R
+
+#define CONFIG_PHY_ADDR		8
+
+#define MESON_FDTFILE_SETTING "fdtfile=amlogic/meson-gxl-s905x-khadas-vim.dtb\0"
+
+#include <configs/meson-gxbb-common.h>
+
+#endif /* __CONFIG_H */