jtag/kitprog: switch to command 'adapter serial'

The driver kitprog defines the command 'kitprog_serial' to specify
the serial string of the adapter.

Remove and deprecate the driver command, and use 'adapter serial'.

Change-Id: I844cb815af01137392b6d12e1b5972fc77ac092d
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6652
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Tested-by: jenkins

src/jtag/startup.tcl

@@ -759,4 +759,10 @@ proc "ftdi serial" {args} {
 	eval adapter serial $args
 }
 
+lappend _telnet_autocomplete_skip kitprog_serial
+proc kitprog_serial args {
+	echo "DEPRECATED! use 'adapter serial' not 'kitprog_serial'"
+	eval adapter serial $args
+}
+
 # END MIGRATION AIDS