printk: Export a symbol.

ascend inclusion
category: bugfix
Bugzilla: N/A
CVE: N/A

-------------------------------------------
Signed-off-by: NXu Qiang <xuqiang36@huawei.com>
Acked-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

kernel/printk/printk_safe.c

@@ -291,6 +291,7 @@ void printk_safe_flush_on_panic(void)
 
 	printk_safe_flush();
 }
+EXPORT_SYMBOL_GPL(printk_safe_flush_on_panic);
 
 #ifdef CONFIG_PRINTK_NMI
 /*