net: Add wget application

This commit adds a simple wget command that can download files
from http server.

The command syntax is
wget ${loadaddr} <path of the file from server>

Signed-off-by: Duncan Hare <DuncanCHare@yahoo.com>
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Cc: Christian Gmeiner <christian.gmeiner@gmail.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 79848cc..a4b6fc6 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1812,6 +1812,13 @@
 	  is complete.  Enable this option to disable this behavior and instead
 	  require files to be loaded over the network by subsequent commands.
 
+config CMD_WGET
+	bool "wget"
+	select TCP
+	help
+	  wget is a simple command to download kernel, or other files,
+	  from a http server over TCP.
+
 config CMD_MII
 	bool "mii"
 	imply CMD_MDIO