generic_board: do not set gd->fdt_blob unless CONFIG_OF_CONTROL=y

gd->fdt_blob is used for FDT control of U-Boot.
If CONFIG_OF_CONTROL is not defined, it is useless.

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

common/board_f.c

@@ -341,6 +341,7 @@ static int setup_ram_buf(void)
 
 static int setup_fdt(void)
 {
+#ifdef CONFIG_OF_CONTROL
 # ifdef CONFIG_OF_EMBED
 	/* Get a pointer to the FDT */
 	gd->fdt_blob = __dtb_dt_begin;
@@ -356,6 +357,7 @@ static int setup_fdt(void)
 	/* Allow the early environment to override the fdt address */
 	gd->fdt_blob = (void *)getenv_ulong("fdtcontroladdr", 16,
 						(uintptr_t)gd->fdt_blob);
+#endif
 	return 0;
 }