common: board_f: Use IS_ENABLED(CONFIG_TIMER_EARLY) in initf_dm

Use IS_ENABLED(CONFIG_TIMER_EARLY) instead of #ifdef in initf_dm. Also,
move timer code to the main ifdef, so that ret is defined.

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/board_f.c

@@ -775,11 +775,12 @@ static int initf_dm(void)
 	bootstage_accum(BOOTSTAGE_ID_ACCUM_DM_F);
 	if (ret)
 		return ret;
-#endif
-#ifdef CONFIG_TIMER_EARLY
-	ret = dm_timer_init();
-	if (ret)
-		return ret;
+
+	if (IS_ENABLED(CONFIG_TIMER_EARLY)) {
+		ret = dm_timer_init();
+		if (ret)
+			return ret;
+	}
 #endif
 
 	return 0;