Add support for 64 bit parameter to irscan

Change-Id: I89e0422456c59ee86c4b6d9bd3b3ad32051b31ac
Signed-off-by: Evan Hunter <ehunter@broadcom.com>
Reviewed-on: http://openocd.zylin.com/831
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Allow autoscan up to 64 bit IR lengths

Change-Id: Ib15ff67b57606fe6c7997f3f9bd90e096acd5f3d
Signed-off-by: Evan Hunter <ehunter@broadcom.com>
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/832
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>