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 --cc drivers/net/wireless/iwlwifi/Makefile
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-1000.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-5000.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-6000.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-agn-tt.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-agn-tt.h
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-agn.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-core.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-core.h
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-dev.h
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-power.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-power.h
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-tx.c
Simple merge