board_f: Drop the extra fdtdec_prepare_fdt()

This is already called earlier, from fdtdec_setup(), so drop this unnecessary
call from the init sequence.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/common/board_f.c b/common/board_f.c
index 1b88822..4b74835 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -912,9 +912,6 @@
 #ifdef CONFIG_SANDBOX
 	sandbox_early_getopt_check,
 #endif
-#ifdef CONFIG_OF_CONTROL
-	fdtdec_prepare_fdt,
-#endif
 	display_options,	/* say that we are here */
 	display_text_info,	/* show debugging info if required */
 #if defined(CONFIG_MPC8260)