Staging: ipack: delete sysfs from to-do list.

As we have already got rid of sysfs files in the tpci200 driver, it is needed
to delete that mention in the TODO file.

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>