habanalabs: add return code field to module iterator

Up until now the module iterator called void callback functions
and so caller activating callback that may fail suffered from 2 issues:
1. The need to "plant" return called in the private data. This is a
   drawback since the iterator itself should not be aware of the private
   data of the caller.
2. Due to 1 even in a failure the iterator would keep iterating instead
   of break upon error.

To overcome this an optional rc field added to the iterator context.

Signed-off-by: Ohad Sharabi <osharabi@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>