generic-board: show model name in board_init_f() too

The common/board_r.c has show_model_r() to display the model name
if the DTB has a "model" property.  It sounds useful to have a similar
function in common/board_f.c too because most of the boards show
their board name before relocation.

Instead of implementing the same function in both common/board_f.c
and common/board_r.c, let's split it up into common/show_board_info.c.

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

common/board_info.c

@@ -0,0 +1,35 @@
+/*
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <libfdt.h>
+#include <linux/compiler.h>
+
+int __weak checkboard(void)
+{
+	printf("Board: Unknown\n");
+	return 0;
+}
+
+/*
+ * If the root node of the DTB has a "model" property, show it.
+ * If CONFIG_OF_CONTROL is disabled or the "model" property is missing,
+ * fall back to checkboard().
+ */
+int show_board_info(void)
+{
+#ifdef CONFIG_OF_CONTROL
+	DECLARE_GLOBAL_DATA_PTR;
+	const char *model;
+
+	model = fdt_getprop(gd->fdt_blob, 0, "model", NULL);
+
+	if (model) {
+		printf("Model: %s\n", model);
+		return 0;
+	}
+#endif
+
+	return checkboard();
+}