net: e1000e: Remove unused declarations

Commit bdfe2da6 ("e1000e: cosmetic move of function prototypes to the new mac.h")
declared but never implemented them.
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://lore.kernel.org/r/20230814135821.4808-1-yuehaibing@huawei.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -29,8 +29,6 @@ s32 e1000e_set_fc_watermarks(struct e1000_hw *hw);
 s32 e1000e_setup_fiber_serdes_link(struct e1000_hw *hw);
 s32 e1000e_setup_led_generic(struct e1000_hw *hw);
 s32 e1000e_setup_link_generic(struct e1000_hw *hw);
-s32 e1000e_validate_mdi_setting_generic(struct e1000_hw *hw);
-s32 e1000e_validate_mdi_setting_crossover_generic(struct e1000_hw *hw);
 
 void e1000e_clear_hw_cntrs_base(struct e1000_hw *hw);
 void e1000_clear_vfta_generic(struct e1000_hw *hw);