iwlagn: no 3945 define needed

Remove 3945 define

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

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

@@ -83,7 +83,6 @@ enum {
 
 enum {
 	IWL_FIRST_OFDM_RATE = IWL_RATE_6M_INDEX,
-	IWL39_LAST_OFDM_RATE = IWL_RATE_54M_INDEX,
 	IWL_LAST_OFDM_RATE = IWL_RATE_60M_INDEX,
 	IWL_FIRST_CCK_RATE = IWL_RATE_1M_INDEX,
 	IWL_LAST_CCK_RATE = IWL_RATE_11M_INDEX,