zy1000: fixed link to Zylin ZY1000 JTAG Probe

zy1000: fixed link to Zylin ZY1000 JTAG Probe

This patch fixes the link to the Zylin ZY1000 JTAG Probe webpage.
The ZY1000 product line was acquired by Ultimate Solutions, Inc. in May 2011.

Change-Id: If68cd45a0c47aa20b2e4bb62939b2c505c8c8c2e
Signed-off-by: Bill Traynor <wmat@alphatroop.com>
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
Reviewed-on: http://openocd.zylin.com/571
Tested-by: jenkins
Reviewed-by: Peter Stuge <peter@stuge.se>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>