Octeontx-pf: Update SGMII mode mapping

Octeontx-pf: Update SGMII mode mapping

Current implementation maps ethtool link modes 10baseT/100baseT/1000baseT
to single firmware mode SGMII. This create a problem for end users who want
to advertise only one speed among them.

This patch addresses the issue by mapping each ethtool link mode
to a corresponding firmware mode also updates new modes supported
by firmware.

Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Link: https://patch.msgid.link/20250625092107.9746-2-hkelam@marvell.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>