habanalabs: remove access to kernel memory using debugfs

Accessing kernel allocated memory through debugfs should not
be allowed as it introduces a security vulnerability.
We remove the option to read/write kernel memory for all asics.

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