iwlwifi: mvm: freeze 7265D and 3168 on API version 29

iwl7265D and iwl3168 are frozen on API version 29.
Set the MAX API allowed level to 29 from now on.

Signed-off-by: Dor Shaish <dor.shaish@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>