igb: Support to enable EEE on all eee_supported devices

Current implementation enables EEE on only i350 device. This patch enables
EEE on all eee_supported devices. Also, configured LPI clock to keep
running before EEE is enabled on i210 and i211 devices.

Signed-off-by: Akeem G. Abodunrin <akeem.g.abodunrin@intel.com>
Tested-by: Jeff Pieper  <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/igb/e1000_defines.h b/drivers/net/ethernet/intel/igb/e1000_defines.h
index cae3070..de4b41e 100644
--- a/drivers/net/ethernet/intel/igb/e1000_defines.h
+++ b/drivers/net/ethernet/intel/igb/e1000_defines.h
@@ -857,8 +857,9 @@
 #define E1000_IPCNFG_EEE_100M_AN     0x00000004  /* EEE Enable 100M AN */
 #define E1000_EEER_TX_LPI_EN         0x00010000  /* EEE Tx LPI Enable */
 #define E1000_EEER_RX_LPI_EN         0x00020000  /* EEE Rx LPI Enable */
-#define E1000_EEER_FRC_AN            0x10000000 /* Enable EEE in loopback */
+#define E1000_EEER_FRC_AN            0x10000000  /* Enable EEE in loopback */
 #define E1000_EEER_LPI_FC            0x00040000  /* EEE Enable on FC */
+#define E1000_EEE_SU_LPI_CLK_STP     0X00800000  /* EEE LPI Clock Stop */
 
 /* SerDes Control */
 #define E1000_GEN_CTL_READY             0x80000000