net: Add prototype for update_tftp

This function should be declared in net.h.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>

include/net.h

@@ -695,6 +695,9 @@ extern void copy_filename(char *dst, const char *src, int size);
 /* get a random source port */
 extern unsigned int random_port(void);
 
+/* Update U-Boot over TFTP */
+extern int update_tftp(ulong addr);
+
 /**********************************************************************/
 
 #endif /* __NET_H__ */