ftdi: use "adapter usb location" instead of ftdi_location command

Use unified "adapter usb location" instead of driver specific
command.

Change-Id: I568a76b87d09cea0f40f1580cf81f7c51402f6f1
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-on: http://openocd.zylin.com/4771
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

src/target/startup.tcl

@@ -221,3 +221,9 @@ proc cortex_a8 args {
 	echo "DEPRECATED! use 'cortex_a' not 'cortex_a8'"
 	eval cortex_a $args
 }
+
+# deprecated ftdi cmds
+proc ftdi_location args {
+	echo "DEPRECATED! use 'adapter usb location' not 'ftdi_location'"
+	eval adapter usb location $args
+}