Revert "[mstlink] Fixing lane width for 50G PAM4"

Author: mataneli94

mlxlink/modules/mlxlink_maps.cpp

@@ -396,7 +396,6 @@ MlxlinkMaps::MlxlinkMaps() {
     _ExtETHSpeed2Lanes[ETH_LINK_SPEED_EXT_XLAUI_4] = 4;
     _ExtETHSpeed2Lanes[ETH_LINK_SPEED_EXT_25GAUI_1] = 1;
     _ExtETHSpeed2Lanes[ETH_LINK_SPEED_EXT_50GAUI_2] = 2;
-    _ExtETHSpeed2Lanes[ETH_LINK_SPEED_EXT_50GAUI_1] = 1;
     _ExtETHSpeed2Lanes[ETH_LINK_SPEED_EXT_CAUI_4] = 4;
     _ExtETHSpeed2Lanes[ETH_LINK_SPEED_EXT_100GAUI_2] = 2;
     _ExtETHSpeed2Lanes[ETH_LINK_SPEED_EXT_200GAUI_4] = 4;