octeontx2-af: Backport ethtool link modes

commit a15f75d6523494770b941f84cf31ec0fa3ef5926 from
git@git.assembla.com:cavium/WindRiver.linux.git

Update current link modes such that cgx modes chip-to-chip(c2c)
maps with SR_Full_BIT and chip-to-module(c2m) maps with LR_Full_BIT.

Change-Id: Ic016fef1d2ba943a679fa7e52b8cdf5cc21434f9
Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/47410


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>