staging: ccree: remove sysfs if of deleted code

The ccree cycle count mechanism was removed in
commit 7f821f0c

 ("staging: ccree: remove cycle count debug support")
but the sysfs interface lingered on. Remove it now.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>