cfg80211: constify name parameter to add_virtual_intf

The name can't be modified by the driver,
make it const.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 80051ff..ab78b53 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1628,7 +1628,7 @@
 	void	(*set_wakeup)(struct wiphy *wiphy, bool enabled);
 
 	struct wireless_dev * (*add_virtual_intf)(struct wiphy *wiphy,
-						  char *name,
+						  const char *name,
 						  enum nl80211_iftype type,
 						  u32 *flags,
 						  struct vif_params *params);