Revert "octeontx2-pf: Add LIO3 link modes to ethtool's list of supported modes"

commit c7d93b72786f3782d6c9bb291ef1110b3a6deee9 from
git@git.assembla.com:cavium/WindRiver.linux.git

This reverts commit bd1bb56efdeb1b0a4fafa531fe083c485dd80c85.

Change-Id: I178f3a43afa224158a69038b2bf19977cb187844
Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/47408


Reviewed-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Tested-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>