common: Move do_tftpb() to net.h

This function belongs in the network header file. Move it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/pxe.c b/cmd/pxe.c
index 73f1b4f..194a366 100644
--- a/cmd/pxe.c
+++ b/cmd/pxe.c
@@ -6,6 +6,7 @@
 
 #include <common.h>
 #include <command.h>
+#include <net.h>
 
 #include "pxe_utils.h"
 
diff --git a/include/common.h b/include/common.h
index 84fd275..7e2de23 100644
--- a/include/common.h
+++ b/include/common.h
@@ -80,9 +80,6 @@
 extern ulong save_addr;		/* Default Save Address */
 extern ulong save_size;		/* Default Save Size */
 
-/* common/cmd_net.c */
-int do_tftpb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
-
 /* common/cmd_fat.c */
 int do_fat_fsload(cmd_tbl_t *, int, int, char * const []);
 
diff --git a/include/net.h b/include/net.h
index 834f244..a8ee081 100644
--- a/include/net.h
+++ b/include/net.h
@@ -51,6 +51,17 @@
 };
 
 /**
+ * do_tftpb - Run the tftpboot command
+ *
+ * @cmdtp: Command information for tftpboot
+ * @flag: Command flags (CMD_FLAG_...)
+ * @argc: Number of arguments
+ * @argv: List of arguments
+ * @return result (see enum command_ret_t)
+ */
+int do_tftpb(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]);
+
+/**
  * An incoming packet handler.
  * @param pkt    pointer to the application packet
  * @param dport  destination UDP port