iwlwifi: move iwl_sta_modify_enable_tid_tx to iwl-sta.c

This patch moves iwl_sta_modify_enable_tid_tx into iwl-sta.c.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.h b/drivers/net/wireless/iwlwifi/iwl-sta.h
index 500e1df..3d55716 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sta.h
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.h
@@ -45,4 +45,5 @@
 int iwl_rxon_add_station(struct iwl_priv *priv, const u8 *addr, int is_ap);
 u8 iwl_remove_station(struct iwl_priv *priv, const u8 *addr, int is_ap);
 int iwl_get_sta_id(struct iwl_priv *priv, struct ieee80211_hdr *hdr);
+void iwl_sta_modify_enable_tid_tx(struct iwl_priv *priv, int sta_id, int tid);
 #endif /* __iwl_sta_h__ */