iwlagn: replace beacon_time_fsf_bits variable with #define

All devices use the same value for beacon_time_tsf_bits.  Use the #define

Signed-off-by: Don Fry <donald.h.fry@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-2000.c

@@ -159,8 +159,6 @@ static int iwl2000_hw_set_hw_params(struct iwl_priv *priv)
 	if (priv->cfg->need_temp_offset_calib)
 		hw_params(priv).calib_init_cfg |= BIT(IWL_CALIB_TEMP_OFFSET);
 
-	hw_params(priv).beacon_time_tsf_bits = IWLAGN_EXT_BEACON_TIME_POS;
-
 	return 0;
 }