tcl/interface/ftdi: correct LED config for BusBlaster KT-Link

Configure the LED to be off by default, blink on activity.

Change-Id: I8515ee66c49bddf866268b85811be15c2dbc086c
Signed-off-by: Anton Kuzmin <anton.kuzmin@cs.fau.de>
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/2539
Tested-by: jenkins

tcl/interface/ftdi/dp_busblaster_kt-link.cfg

@@ -16,6 +16,6 @@ ftdi_vid_pid 0x0403 0x6010
 ftdi_layout_init 0x8c28 0xff3b
 ftdi_layout_signal nTRST -data 0x0100 -noe 0x0400
 ftdi_layout_signal nSRST -data 0x0200 -noe 0x0800
-ftdi_layout_signal LED -data 0x8000
+ftdi_layout_signal LED -ndata 0x8000
 ftdi_layout_signal SWD_EN -ndata 0x0020 -oe 0x2000
 ftdi_layout_signal SWDIO_OE -ndata 0x1000