e1000e: cleanup: remove comments which are no longer applicable

Code was removed but the applicable comments were not.
Signed-off-by: NBruce Allan <bruce.w.allan@intel.com>
Tested-by: NAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/e1000e/defines.h

@@ -261,8 +261,6 @@
 #define E1000_STATUS_PHYRA      0x00000400      /* PHY Reset Asserted */
 #define E1000_STATUS_GIO_MASTER_ENABLE 0x00080000 /* Status of Master requests. */
 
-/* Constants used to interpret the masked PCI-X bus speed. */
-
 #define HALF_DUPLEX 1
 #define FULL_DUPLEX 2
 
@@ -330,8 +328,6 @@
 #define E1000_TCTL_RTLC   0x01000000    /* Re-transmit on late collision */
 #define E1000_TCTL_MULR   0x10000000    /* Multiple request support */
 
-/* Transmit Arbitration Count */
-
 /* SerDes Control */
 #define E1000_SCTL_DISABLE_SERDES_LOOPBACK 0x0400
 
@@ -800,9 +796,6 @@
 #define M88E1000_PSCR_AUTO_X_1000T     0x0040
 /* Auto crossover enabled all speeds */
 #define M88E1000_PSCR_AUTO_X_MODE      0x0060
-/* 1=Enable Extended 10BASE-T distance (Lower 10BASE-T Rx Threshold)
- * 0=Normal 10BASE-T Rx Threshold
- */
 #define M88E1000_PSCR_ASSERT_CRS_ON_TX 0x0800 /* 1=Assert CRS on Transmit */
 
 /* M88E1000 PHY Specific Status Register */