net: tftp: Move tftp.h file from ./net to ./include/net

This change gives the ability to reuse the <tftp.h> header file by other
subsystems (like e.g. dfu).

Without this change compilation error emerges for the legacy update.c file.

Signed-off-by: Lukasz Majewski <l.majewski@majess.pl>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

include/net/tftp.h

@@ -0,0 +1,30 @@
+/*
+ *	LiMon - BOOTP/TFTP.
+ *
+ *	Copyright 1994, 1995, 2000 Neil Russell.
+ *	Copyright 2011 Comelit Group SpA
+ *	               Luca Ceresoli <luca.ceresoli@comelit.it>
+ *	(See License)
+ */
+
+#ifndef __TFTP_H__
+#define __TFTP_H__
+
+/**********************************************************************/
+/*
+ *	Global functions and variables.
+ */
+
+/* tftp.c */
+void tftp_start(enum proto_t protocol);	/* Begin TFTP get/put */
+
+#ifdef CONFIG_CMD_TFTPSRV
+void tftp_start_server(void);	/* Wait for incoming TFTP put */
+#endif
+
+extern ulong tftp_timeout_ms;
+extern int tftp_timeout_count_max;
+
+/**********************************************************************/
+
+#endif /* __TFTP_H__ */