igc: Remove unused asymmetric pause bit from igc defines

The CR_1000T_ASYM_PAUSE bit from igc defines is not used so remove it.
Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/igc/igc_defines.h

@@ -128,7 +128,6 @@
 #define NWAY_LPAR_ASM_DIR	0x0800 /* LP Asymmetric Pause Direction bit */
 
 /* 1000BASE-T Control Register */
-#define CR_1000T_ASYM_PAUSE	0x0080 /* Advertise asymmetric pause bit */
 #define CR_1000T_HD_CAPS	0x0100 /* Advertise 1000T HD capability */
 #define CR_1000T_FD_CAPS	0x0200 /* Advertise 1000T FD capability  */