iwlwifi: mvm: make sure state isn't in d0i3 when stopping fw monitor

In case platform is in d0i3 - make sure it is awake when
writing the registers to stop the monitor when collecting FW
debug data. Plus, remove unneeded mutex locking currently
done.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NEmmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/mvm/debugfs.c

@@ -988,9 +988,14 @@ static ssize_t iwl_dbgfs_fw_dbg_collect_write(struct iwl_mvm *mvm,
 					      char *buf, size_t count,
 					      loff_t *ppos)
 {
-	mutex_lock(&mvm->mutex);
+	int ret = iwl_mvm_ref_sync(mvm, IWL_MVM_REF_PRPH_WRITE);
+
+	if (ret)
+		return ret;
+
 	iwl_mvm_fw_dbg_collect(mvm);
-	mutex_unlock(&mvm->mutex);
+
+	iwl_mvm_unref(mvm, IWL_MVM_REF_PRPH_WRITE);
 
 	return count;
 }