Fix idcode end of chain flag.

Fix idcode end of chain flag.

For multi core cpus with cores without an idcode this doesn't work
because the extra bit for every core and a n-bit shift in the data
stream.

Change-Id: Iba0ad9422ea55c01492b27b936d028719be31180
Signed-off-by: Mathias K <kesmtp@freenet.de>
Reviewed-on: http://openocd.zylin.com/618
Tested-by: jenkins
Reviewed-by: Bill Traynor <wmat@alphatroop.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>