iwlwifi: mvm: support dqa-enable hcmd

Support sending the DQA-enablement HCMD to the FW when
working in DQA mode.

This HCMD will enable DQA-specific flows in the FW.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>