sandbox: move source files from board/ to arch/sandbox/

Prior to commit 33a02da0, all boards must have board/${BOARD}/
or board/${VENDOR}/${BOARD}/ directory.
Now this rule is obsolete.

It looks weird that sandbox defines "vendor" and "board" just for
meeting the old U-Boot directory structure.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Simon Glass <sjg@chromium.org>

arch/sandbox/lib/sandbox.c

@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <cros_ec.h>
+#include <dm.h>
+#include <os.h>
+#include <asm/u-boot-sandbox.h>
+
+/*
+ * Pointer to initial global data area
+ *
+ * Here we initialize it.
+ */
+gd_t *gd;
+
+/* Add a simple GPIO device */
+U_BOOT_DEVICE(gpio_sandbox) = {
+	.name = "gpio_sandbox",
+};
+
+void flush_cache(unsigned long start, unsigned long size)
+{
+}
+
+unsigned long timer_read_counter(void)
+{
+	return os_get_nsec() / 1000;
+}
+
+int dram_init(void)
+{
+	gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
+	return 0;
+}
+
+#ifdef CONFIG_BOARD_EARLY_INIT_F
+int board_early_init_f(void)
+{
+#ifdef CONFIG_VIDEO_SANDBOX_SDL
+	int ret;
+
+	ret = sandbox_lcd_sdl_early_init();
+	if (ret) {
+		puts("Could not init sandbox LCD emulation\n");
+		return ret;
+	}
+#endif
+
+	return 0;
+}
+#endif
+
+int arch_early_init_r(void)
+{
+#ifdef CONFIG_CROS_EC
+	if (cros_ec_board_init()) {
+		printf("%s: Failed to init EC\n", __func__);
+		return 0;
+	}
+#endif
+
+	return 0;
+}
+
+#ifdef CONFIG_BOARD_LATE_INIT
+int board_late_init(void)
+{
+	if (cros_ec_get_error()) {
+		/* Force console on */
+		gd->flags &= ~GD_FLG_SILENT;
+
+		printf("cros-ec communications failure %d\n",
+		       cros_ec_get_error());
+		puts("\nPlease reset with Power+Refresh\n\n");
+		panic("Cannot init cros-ec device");
+		return -1;
+	}
+	return 0;
+}
+#endif