iwlwifi: mvm: enable L3 filtering

Firmware will support filtering multicast L3 packets.
The L3 filtering is configured by the WOWLAN_CONFIG command.
All flags should be enabled by default.
Older firmware is not affected as it does not look into
this field.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>