printk: export log_buf_addr_get/log_buf_len_get

ascend inclusion
category: feature
bugzilla: NA
CVE: NA

-------------------------------------------------

Export log_buf_addr_get()/log_buf_len_get() for bbox driver.
Signed-off-by: NBixuan Cui <cuibixuan@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

kernel/printk/printk.c

@@ -449,12 +449,14 @@ char *log_buf_addr_get(void)
 {
 	return log_buf;
 }
+EXPORT_SYMBOL_GPL(log_buf_addr_get);
 
 /* Return log buffer size */
 u32 log_buf_len_get(void)
 {
 	return log_buf_len;
 }
+EXPORT_SYMBOL_GPL(log_buf_len_get);
 
 /* human readable text of the record */
 static char *log_text(const struct printk_log *msg)