iwlwifi: use pci registers defined in pci_regs.h

This patch replaces where possible usage of pci register
defined in the driver by ones defined in pci_regs.h

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-power.c b/drivers/net/wireless/iwlwifi/iwl-power.c
index 4c5a775..18b7e41 100644
--- a/drivers/net/wireless/iwlwifi/iwl-power.c
+++ b/drivers/net/wireless/iwlwifi/iwl-power.c
@@ -141,7 +141,7 @@
 	int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
 	struct iwl_powertable_cmd *cmd;
 	int i;
-	u16 pci_pm;
+	u16 lctl;
 
 	IWL_DEBUG_POWER(priv, "Initialize power \n");
 
@@ -153,14 +153,14 @@
 	memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
 	memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);
 
-	pci_read_config_word(priv->pci_dev, PCI_CFG_LINK_CTRL, &pci_pm);
+	lctl = iwl_pcie_link_ctl(priv);
 
 	IWL_DEBUG_POWER(priv, "adjust power command flags\n");
 
 	for (i = 0; i < IWL_POWER_MAX; i++) {
 		cmd = &pow_data->pwr_range_0[i].cmd;
 
-		if (pci_pm & PCI_CFG_LINK_CTRL_VAL_L0S_EN)
+		if (lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN)
 			cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 		else
 			cmd->flags |= IWL_POWER_PCI_PM_MSK;