habanalabs: expose soft reset sysfs nodes for inference ASIC

As we allow soft-reset to be performed only on inference devices,
having the sysfs nodes may cause a confusion. Hence, we remove those
nodes on training ASICs.

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