x86: Move timer_init() call a bit earlier

Currently timer_init() is called in board_r.c which is quite late.
Some vgabios execution requires we set up the i8254 timer correctly,
but video initialization comes before timer_init(). Move the call
to board_f.c.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/common/board_f.c b/common/board_f.c
index ed51305..04c273e 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -796,7 +796,7 @@
 	/* TODO: can we rename this to timer_init()? */
 	init_timebase,
 #endif
-#if defined(CONFIG_ARM) || defined(CONFIG_MIPS) || \
+#if defined(CONFIG_X86) || defined(CONFIG_ARM) || defined(CONFIG_MIPS) || \
 		defined(CONFIG_BLACKFIN) || defined(CONFIG_NDS32)
 	timer_init,		/* initialize timer */
 #endif