tcl/interface/ftdi: add kt-link config (with SWD) for DP BusBlaster

Change-Id: Icbeca8c0c3845c0b777fb2e4c81b17e7b7cc5ff8
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/2269
Tested-by: jenkins
Reviewed-by: Ben Gamari <bgamari@gmail.com>
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>