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-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index cf6f4b2..fddc236 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -1234,10 +1234,11 @@
 
 /**
  * struct iwl_trans_ops - transport specific operations
-
  * @rx_init: inits the rx memory, allocate it if needed
  * @rx_free: frees the rx memory
  * @tx_init:inits the tx memory, allocate if needed
+ * @tx_start: starts and configures all the Tx fifo - usually done once the fw
+ *           is alive.
  * @tx_free: frees the tx memory
  * @stop_device:stops the whole device (embedded CPU put to reset)
  * @send_cmd:send a host command
@@ -1256,6 +1257,7 @@
 	void (*rx_free)(struct iwl_priv *priv);
 
 	int (*tx_init)(struct iwl_priv *priv);
+	void (*tx_start)(struct iwl_priv *priv);
 	void (*tx_free)(struct iwl_priv *priv);
 
 	void (*stop_device)(struct iwl_priv *priv);