iwlwifi: mvm: add debugfs hook to take an mvm ref

Support taking an mvm ref (and preventing D0i3) by
writing '1' into the d0i3_refs debugfs file.

The reference can be unref by writing 0 to the same
file.

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h
index f396607..1f53ade 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h
@@ -245,6 +245,7 @@
 	IWL_MVM_REF_ROC,
 	IWL_MVM_REF_P2P_CLIENT,
 	IWL_MVM_REF_AP_IBSS,
+	IWL_MVM_REF_USER,
 
 	IWL_MVM_REF_COUNT,
 };