iwlagn: add tx start API to transport layer

tx start will start the tx queues: basically configure the SCD
Remove the IWLAGN prefix to SCD defines on the way.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-trans.h b/drivers/net/wireless/iwlwifi/iwl-trans.h
index 55e6c33..16cdb89 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans.h
+++ b/drivers/net/wireless/iwlwifi/iwl-trans.h
@@ -79,6 +79,11 @@
 	return priv->trans.ops->tx_init(priv);
 }
 
+static inline void trans_tx_start(struct iwl_priv *priv)
+{
+	priv->trans.ops->tx_start(priv);
+}
+
 static inline void trans_tx_free(struct iwl_priv *priv)
 {
 	priv->trans.ops->tx_free(priv);