iwlwifi: TLC modifications

1. Merge TLC fixes from AP support code
2. Remove struct iwl4965_rate
3. Misc code restructuring

Signed-off-by: Guy Cohen <guy.cohen@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>