STLINK: swd transport renamed and jtag+swim transport added

This patch add jtag support to the stlink driver add
two new transport types, JTAG and SWIM.

Change-Id: I7089d74250330be5c6a01c24066307641df7d11e
Signed-off-by: Mathias K <kesmtp@freenet.de>
Reviewed-on: http://openocd.zylin.com/393
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

tcl/target/stm32_stlink.cfg

@@ -23,6 +23,11 @@ if { [info exists CPUTAPID] } {
    set _CPUTAPID 0x1ba01477
 }
 
+#
+# possibles value are stlink_swd or stlink_jtag
+#
+transport select stlink_swd
+
 stlink newtap $_CHIPNAME cpu -expected-id $_CPUTAPID
 
 set _TARGETNAME $_CHIPNAME.cpu