iwlwifi: Remove inconsistent and redundant declaration

Remove declaration of iwl_alloc_traffic_mem from iwl-agn.h,
from methods that was exposed to support MVM.

MVM doesn't have to use this declaration.
Signed-off-by: David Spinadel <david.spinadel@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

drivers/net/wireless/iwlwifi/iwl-agn.h

@@ -510,7 +510,6 @@ void iwl_setup_deferred_work(struct iwl_priv *priv);
 int iwl_send_wimax_coex(struct iwl_priv *priv);
 int iwl_send_bt_env(struct iwl_priv *priv, u8 action, u8 type);
 void iwl_debug_config(struct iwl_priv *priv);
-int iwl_alloc_traffic_mem(struct iwl_priv *priv);
 void iwl_set_hw_params(struct iwl_priv *priv);
 void iwl_init_context(struct iwl_priv *priv, u32 ucode_flags);
 int iwl_init_drv(struct iwl_priv *priv);