jtag: drivers: stlink: handle all versions with single config

jtag: drivers: stlink: handle all versions with single config

Extend HLA interface to allow multiple VID/PID pairs and use it to
autodetect the connected stlink version.

Change-Id: I35cd895b2260e23cf0e8fcb1fc11a78c2b99c69b
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/3961
Tested-by: jenkins
Reviewed-by: Karl Palsson <karlp@tweak.net.au>
Reviewed-by: Andreas Bolsch <hyphen0break@gmail.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>