cfg: add Amontec JTAGkey2p interface config (Issue #26)

Signed-off-by: Spencer Oliver <ntfreak@users.sourceforge.net>

tcl/interface/jtagkey2p.cfg

@@ -0,0 +1,11 @@
+#
+# Amontec JTAGkey2P
+#
+# http://www.amontec.com/jtagkey2p.shtml
+#
+
+interface ft2232
+ft2232_device_desc "Amontec JTAGkey-2P"
+ft2232_layout jtagkey
+ft2232_vid_pid 0x0403 0xCFF8
+