parport: add "aspo" hotpluggable adapter config

parport: add "aspo" hotpluggable adapter config

This adds a new adapter config.

Design files are available from:

http://turkos.aspodata.se/git/openhw/isp/pp_jtag_arm20.sch
http://turkos.aspodata.se/git/openhw/isp/pp_jtag_arm20.pcb

No need to document it anywhere as only a single device was ever
built.

Change-Id: If031fdb9dedb1e544401747bfb7fbc5afc4d5407
Signed-off-by: Karl Hammar <karl@aspodata.se>
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/2094
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>