iwlwifi: separate thermal throttling function

"Thermal Throttling" is an advance feature which only available for
newer _agn devices. Move from iwl-core to iwl-agn for better code
organization.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-6000.c b/drivers/net/wireless/iwlwifi/iwl-6000.c
index af4fd50..7902de17 100644
--- a/drivers/net/wireless/iwlwifi/iwl-6000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-6000.c
@@ -330,6 +330,11 @@
 	.check_ack_health = iwl_good_ack_health,
 	.txfifo_flush = iwlagn_txfifo_flush,
 	.dev_txfifo_flush = iwlagn_dev_txfifo_flush,
+	.tt_ops = {
+		.lower_power_detection = iwl_tt_is_low_power_state,
+		.tt_power_mode = iwl_tt_current_power_mode,
+		.ct_kill_check = iwl_check_for_ct_kill,
+	}
 };
 
 static const struct iwl_ops iwl6000_ops = {