iwlwifi: move rate helpers to iwlcore

This patch moves rate helpers to iwlcore.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.c b/drivers/net/wireless/iwlwifi/iwl-sta.c
index 3e257cf..fae5d6d 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sta.c
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.c
@@ -824,7 +824,7 @@
 		rate_flags |= RATE_MCS_ANT_B_MSK; /*FIXME:RS*/
 
 		link_cmd.rs_table[i].rate_n_flags =
-			iwl4965_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
+			iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
 		r = iwl4965_get_prev_ieee_rate(r);
 	}