Fastbootd: flashing certification

Change-Id: I564086908942463eebee69449d484ba03effc50e
diff --git a/fastbootd/utils.h b/fastbootd/utils.h
index a553a25..bc4da25 100644
--- a/fastbootd/utils.h
+++ b/fastbootd/utils.h
@@ -42,6 +42,7 @@
 uint64_t get_file_size(int fd);
 uint64_t get_block_device_size(int fd);
 int wipe_block_device(int fd, int64_t len);
+int create_temp_file();
 
 #define ROUND_TO_PAGE(address,pagesize) ((address + pagesize - 1) & (~(pagesize - 1)))