timer: start a new timer after relocation

Start a new timer after relocation, just in case the
timer has been used in per-relocation.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Simon Glass <sjg@chromium.org>

common/board_r.c

@@ -290,6 +290,9 @@ static int initr_dm(void)
 	/* Save the pre-reloc driver model and start a new one */
 	gd->dm_root_f = gd->dm_root;
 	gd->dm_root = NULL;
+#ifdef CONFIG_TIMER
+	gd->timer = NULL;
+#endif
 	return dm_init_and_scan(false);
 }
 #endif