e1000e: add support for IEEE-1588 PTP

Add PTP IEEE-1588 support and make accesible via the PHC subsystem.

v2: make e1000e_ptp_clock_info a static const struct per Stephen Hemminger

Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Reviewed-by: Jacob Keller <Jacob.e.keller@intel.com>
Acked-by: Richard Cochran <richardcochran@gmail.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/e1000e/hw.h b/drivers/net/ethernet/intel/e1000e/hw.h
index 8e7e803..84e6beb 100644
--- a/drivers/net/ethernet/intel/e1000e/hw.h
+++ b/drivers/net/ethernet/intel/e1000e/hw.h
@@ -251,6 +251,8 @@
 	E1000_TSYNCRXCTL = 0x0B620, /* Rx Time Sync Control register - RW */
 	E1000_RXSTMPL   = 0x0B624, /* Rx timestamp Low - RO */
 	E1000_RXSTMPH   = 0x0B628, /* Rx timestamp High - RO */
+	E1000_RXMTRL    = 0x0B634, /* Timesync Rx EtherType and Msg Type - RW */
+	E1000_RXUDP     = 0x0B638, /* Timesync Rx UDP Port - RW */
 };
 
 #define E1000_MAX_PHY_ADDR		4