J-Link: Forcibly select JTAG transport

J-Link: Forcibly select JTAG transport

Some versions of Segger's software do not select JTAG interface by default.
Do it in the intial setup.

Firmware version check code still present, with updated set of unsupported.

Note from Segger:
Alright, we were not aware of that OpenOCD does not select the interface
before it starts communicating with the target.  A debugger should always
select the appropriate target interface before it starts communicating with the target,
since otherwise it could also happen that a previous session with another debugger
had selected SWD and the interface was not switched again by OpenOCD.

Change-Id: I5b4eab7e0e3625ec32be75a36d89e16d17e899bf
Signed-off-by: Alexander Osipenko <sipych@gmail.com>
Reviewed-on: http://openocd.zylin.com/667
Tested-by: jenkins
Reviewed-by: Xiaofan <xiaofanc@gmail.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>