habanalabs: expose device security status through sysfs

In order for the user to know if he is running on a secured device
or not, a sysfs node is added.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>