iwlwifi: implement reset flow for Bz devices

On Bz devices, UREG_DOORBELL_TO_ISR6_NMI_BIT no longer actually
triggers an NMI. So instead of setting BIT(0) | BIT(1) for the
reset flow, we need to just set BIT(1) and then force the NMI
in the new way.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211204174546.6b56e7ee1773.I71cba66e17cc0daabc5ad7abd88763674b625c82@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c

@@ -105,9 +105,12 @@ static void iwl_trans_pcie_fw_reset_handshake(struct iwl_trans *trans)
 	if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_AX210)
 		iwl_write_umac_prph(trans, UREG_NIC_SET_NMI_DRIVER,
 				    UREG_NIC_SET_NMI_DRIVER_RESET_HANDSHAKE);
-	else
+	else if (trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_AX210)
 		iwl_write_umac_prph(trans, UREG_DOORBELL_TO_ISR6,
 				    UREG_DOORBELL_TO_ISR6_RESET_HANDSHAKE);
+	else
+		iwl_write32(trans, CSR_DOORBELL_VECTOR,
+			    UREG_DOORBELL_TO_ISR6_RESET_HANDSHAKE);
 
 	/* wait 200ms */
 	ret = wait_event_timeout(trans_pcie->fw_reset_waitq,