interface: opendous_ftdi config file added

This config file add support to the opendous cable based on the chip ft2232H,
using the ft2232 interface driver.

Change-Id: I8171a0c475af8d61e081844ee86466a392138fb0
Signed-off-by: Rodrigo Melo <rmelo@inti.gob.ar>
Reviewed-on: http://openocd.zylin.com/1096
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

tcl/interface/opendous_ftdi.cfg

@@ -0,0 +1,15 @@
+#
+# Opendous
+#
+# http://code.google.com/p/opendous/wiki/JTAG
+#
+# According to the website, it is similar to jtagkey, but it uses channel B
+# (and it has a different pid number).
+#
+
+interface ft2232
+ft2232_device_desc "Dual RS232-HS"
+ft2232_layout jtagkey
+ft2232_vid_pid 0x0403 0x6010
+ft2232_channel 2
+