iwlwifi: mvm: Remove unused inline function iwl_mvm_tid_to_ac_queue

commit cfbc6c4c ("iwlwifi: mvm: support mac80211 TXQs model")
left behind this, remove it.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20200506134217.49760-1-yuehaibing@huawei.comSigned-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/sta.c

@@ -1369,14 +1369,6 @@ static int iwl_mvm_sta_alloc_queue(struct iwl_mvm *mvm,
 	return ret;
 }
 
-static inline u8 iwl_mvm_tid_to_ac_queue(int tid)
-{
-	if (tid == IWL_MAX_TID_COUNT)
-		return IEEE80211_AC_VO; /* MGMT */
-
-	return tid_to_mac80211_ac[tid];
-}
-
 void iwl_mvm_add_new_dqa_stream_wk(struct work_struct *wk)
 {
 	struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm,